Remove unused styles on Windows from gitian qt build

Keeps the "windows", "windowsxp", "windowsvista" styles.

Reduces the size of a static bitcoin-qt.exe by ~400 kB.
Upgrade to Boost 1.50
Update QT to 4.8.3 and openssl to 1.0.1c
add proper license
EmerCoin: Update client version to 0.1.4