stop blockWatcher filter with correct method name. fixes #74

[jorisbontje]

embark blockchain will now stop mining once the account is funded, fixing #74 :

=== datadir created
running: geth --datadir="/tmp/embark" --logfile="/tmp/embark.log" --port 30304 --rpc --rpcport 8101 --rpcaddr localhost --networkid 52790 --rpccorsdomain "*" --minerthreads "1" --mine --genesis="config/genesis/dev_genesis.json" --rpcapi "eth,web3" --maxpeers 4 --password config/password account list
Fatal: Could not list accounts: no keys in store
Fatal: Could not list accounts: no keys in store
running: geth --datadir="/tmp/embark" --logfile="/tmp/embark.log" --port 30304 --rpc --rpcport 8101 --rpcaddr localhost --networkid 52790 --rpccorsdomain "*" --minerthreads "1" --mine --genesis="config/genesis/dev_genesis.json" --rpcapi "eth,web3" --maxpeers 4 --password config/password account new
Address: {2404694595a072c636196caf07ea569d79a713b4}
running: geth --datadir="/tmp/embark" --logfile="/tmp/embark.log" --port 30304 --rpc --rpcport 8101 --rpcaddr localhost --networkid 52790 --rpccorsdomain "*" --minerthreads "1" --mine --genesis="config/genesis/dev_genesis.json" --rpcapi "eth,web3" --maxpeers 4 --password config/password --unlock 2404694595a072c636196caf07ea569d79a713b4 js /tmp/js/mine.js
I0902 10:12:32.501891    7253 database.go:73] Alloted 16MB cache to /tmp/embark/chaindata
I0902 10:12:32.503502    7253 database.go:73] Alloted 16MB cache to /tmp/embark/dapp
I0902 10:12:32.505111    7253 backend.go:291] Protocol Versions: [61 60], Network Id: 52790
I0902 10:12:32.505829    7253 backend.go:303] Successfully wrote genesis block. New genesis hash = 2027e0692e34ff94ba67bb729833dac34e94fbb12127af1c0373a11fe9d21ddc
I0902 10:12:32.505879    7253 backend.go:328] Blockchain DB Version: 3
I0902 10:12:32.505976    7253 chain_manager.go:237] Last block (#0) 2027e0692e34ff94ba67bb729833dac34e94fbb12127af1c0373a11fe9d21ddc TD=11
I0902 10:12:32.510078    7253 cmd.go:125] Starting Geth/v1.1.1/darwin/go1.5
I0902 10:12:32.510214    7253 server.go:311] Starting Server
I0902 10:12:34.615296    7253 udp.go:207] Listening, enode://1772d71723a9d4e2aeda42003b52c2969d337230c8d5520f1dffda107f08225faca7ae4f6e5906d1ed1d907cb3bf522454d70beac0a5556c97778e6af07be10d@[::]:30304
I0902 10:12:34.615530    7253 backend.go:557] Server started
I0902 10:12:34.615564    7253 backend.go:640] Automatic pregeneration of ethash DAG ON (ethash dir: /Users/mids/.ethash)
I0902 10:12:34.615645    7253 server.go:552] Listening on [::]:30304
I0902 10:12:34.615728    7253 backend.go:647] checking DAG (ethash dir: /Users/mids/.ethash)
Account '2404694595a072c636196caf07ea569d79a713b4' unlocked.
I0902 10:12:35.634375    7253 ipc_unix.go:104] IPC service started (/tmp/embark/geth.ipc)
I0902 10:12:35.635605    7253 miner.go:119] Starting mining operation (CPU=1 TOT=3)
I0902 10:12:35.635854    7253 worker.go:540] commit new work on block 1 with 0 txs & 0 uncles. Took 223.57µs
I0902 10:12:35.635924    7253 ethash.go:202] Generating DAG for epoch 0 (0000000000000000000000000000000000000000000000000000000000000000)
== Funding account
I0902 10:12:35.678754    7253 miner.go:119] Starting mining operation (CPU=1 TOT=3)
I0902 10:12:35.679020    7253 worker.go:540] commit new work on block 1 with 0 txs & 0 uncles. Took 227.896µs
I0902 10:12:36.491578    7253 ethash.go:219] Done generating DAG for epoch 0, it took 855.660105ms
I0902 10:12:38.279623    7253 worker.go:322] 🔨  Mined block (#1 / 3e36eac8). Wait 5 blocks for confirmation
I0902 10:12:38.279969    7253 worker.go:540] commit new work on block 2 with 0 txs & 0 uncles. Took 312.637µs
I0902 10:12:38.280173    7253 worker.go:540] commit new work on block 2 with 0 txs & 0 uncles. Took 166.305µs
I0902 10:12:38.697485    7253 worker.go:322] 🔨  Mined block (#2 / 416a5d9d). Wait 5 blocks for confirmation
I0902 10:12:38.697757    7253 worker.go:540] commit new work on block 3 with 0 txs & 0 uncles. Took 244.498µs
I0902 10:12:38.697973    7253 worker.go:540] commit new work on block 3 with 0 txs & 0 uncles. Took 182.393µs
I0902 10:12:39.220405    7253 worker.go:322] 🔨  Mined block (#3 / 19b2ffff). Wait 5 blocks for confirmation
I0902 10:12:39.220818    7253 worker.go:540] commit new work on block 4 with 0 txs & 0 uncles. Took 376.998µs
I0902 10:12:39.221064    7253 worker.go:540] commit new work on block 4 with 0 txs & 0 uncles. Took 201.416µs
I0902 10:12:39.493988    7253 worker.go:322] 🔨  Mined block (#4 / 7dc676b4). Wait 5 blocks for confirmation
I0902 10:12:39.494360    7253 worker.go:540] commit new work on block 5 with 0 txs & 0 uncles. Took 326.932µs
I0902 10:12:39.494594    7253 worker.go:540] commit new work on block 5 with 0 txs & 0 uncles. Took 189.869µs
I0902 10:12:39.642193    7253 worker.go:322] 🔨  Mined block (#5 / ea797875). Wait 5 blocks for confirmation
I0902 10:12:39.642609    7253 worker.go:540] commit new work on block 6 with 0 txs & 0 uncles. Took 377.601µs
I0902 10:12:39.642954    7253 worker.go:540] commit new work on block 6 with 0 txs & 0 uncles. Took 261.779µs
== Account funded
I0902 10:12:48.978034    7253 xeth.go:985] Tx(0xd4c136e015fc04b256f4453e7d5fbca46f0192d15e5f4288e42a6107b2ca487c) created: 0x0f00476315f759e03476edd64795c8cae6328c5b
== Pending transactions! Looking for next block...
I0902 10:12:49.250593    7253 miner.go:119] Starting mining operation (CPU=1 TOT=3)
I0902 10:12:49.251329    7253 worker.go:540] commit new work on block 6 with 1 txs & 0 uncles. Took 707.52µs
I0902 10:12:50.723454    7253 worker.go:322] 🔨  Mined block (#6 / 0ec3276b). Wait 5 blocks for confirmation
I0902 10:12:50.723885    7253 worker.go:540] commit new work on block 7 with 0 txs & 0 uncles. Took 390.176µs
I0902 10:12:50.723962    7253 worker.go:420] 🔨 🔗  Mined 5 blocks back: block #1
I0902 10:12:50.724363    7253 worker.go:540] commit new work on block 7 with 0 txs & 0 uncles. Took 358.317µs
== No transactions left. Stopping miner...