Minor changes to magic variables.

gas moves to "msg", ripemd160 returns hash160.
Merge pull request #546 from chriseth/sol_minorChangeToMagic

Minor changes to magic variables.
Avoid 20ms sleep time in Whisper.
Merge branch 'develop' of github.com:ethereum/cpp-ethereum into develop
Remove minGasPrice
Latest PoC-7 changes.
Warning fix.
ECDSA recover fix.
Version bump.
Remove old bloom stuff.
Fix genesis.
Variable EXP gas cost.
Compile fix.