m0.9.4: Merged in coinplugin/go-metadium (pull request #20)

Gmet v0.9.4 is a miner upgrade containing following changes.

• Channel deadlock fix in miner worker (e1cceb9)
• Better 'pending' block support in non-mining nodes (fa38e14)
• A new API, SendRawTransactions, is added for better scaling (d0b00c9)
• Other commits are mostly for scripting support

Commits

• brought back PORT option to gmet.sh
• updated gmet.sh with GMET_OPTS and PORT options in .rc file
• fixed newWorkCh channel deadlock
• updating pending block upon receiving a block
• added loadFile() and msleep() for better js scripting
• governance deployment script in js
• fixed and updated .js version of governance initializer
• added SendRawTransactions() api
• brought back 'start-inner' command to gmet.sh for docker-compose
• added offline wallet support for better scripting
• added offline ledger and trezor support. upgraded trezor doesn't work, though
• for offline wallet path, default scheme, i.e. missing scheme, is keystore file
• Test governance deployer is in javascript, not in go any more. It supports ledger, too.
• added password option to governance initialization command
• removed '-it' option in 'gmet-linux' target for non-interactive build
• Version now is 0.9.4