Backporting to beta

[arkpar]

No description provided.

[5chdn]

If there is nothing else, these are the changes:

## Parity [v1.6.8](https://github.com/paritytech/parity/releases/tag/v1.6.8) (2017-06-07)

This release addresses:

- a rare condition where quickly creating a new account was generating an account not matching the recovery phrase.
- compressed RLP strings caused wrong/empty transaction receipts on Classic network.
- blacklisting the _empty phrase_ account from UI and RPC on non-development chains. See also [this blog post](https://blog.parity.io/restoring-blank-seed-phrase/).
- canceling transactions that didn't have a condition.
- the updated Expanse fork block and chain ID.

Full changelog:

- Backporting to beta [#5791](https://github.com/paritytech/parity/pull/5791)
  - Bump to v1.6.8
  - Update expanse json with fork at block 600000 [#5351](https://github.com/paritytech/parity/pull/5351)
    - Update expanse json with fork at block 600000
    - Update exp chainID to 2
  - Bumped mio [#5763](https://github.com/paritytech/parity/pull/5763)
  - Fixed default UI port for mac installer [#5782](https://github.com/paritytech/parity/pull/5782)
  - Blacklist empty phrase account. [#5730](https://github.com/paritytech/parity/pull/5730)
  - Update Cid/multihash/ring/tinykeccak [#5785](https://github.com/paritytech/parity/pull/5785)
    - Updating ring,multihash,tiny-keccak
    - Updating CID in ipfs.
  - Disable compression for RLP strings [#5786](https://github.com/paritytech/parity/pull/5786)
- Beta Backports [#5789](https://github.com/paritytech/parity/pull/5789)
  - Fix local transactions without condition. [#5716](https://github.com/paritytech/parity/pull/5716)
  - Block invalid account name creation [#5784](https://github.com/paritytech/parity/pull/5784)
    - Additional non-empty phrase check (fromNew)
    - Explicit canCreate check in create (not only on UI)
    - BN instance check (fixes Geth imports)
    - Fixup tests after better checks
  - Recover from empty phrase in dev mode [#5698](https://github.com/paritytech/parity/pull/5698)
    - Add dev chain to isTest
    - Fix signer
    - Fix no condition transactions
    - Fix case: old parity
    - Fix propTypes.