Project name, builds and Gitian

[dexX7]

There are three points that screw deterministic, cross-plattform building of Master Core:

1. Outdated build descriptors

This is not a no-go, and the build actually works, but the Gitian descriptors are not up-to-date, see: bitcoin/bitcoin@mastercoin-MSC:mscore-0.0.9...0.9

2. Project name mismatch

Not all relevant names were updated when "Bitcoin" was changed to "Master" (or "Omni"), e.g. setup related files, or the Gitian descriptors. A workaround is to revert the name change: dexX7@419045f

3. QT version incompabilities

Depending on the build, there are incompabilities due to interface changes of QT. PR submitted to @zathras-crypto UI branch: zathras-crypto#14

[dexX7]

Now mostly a duplicate of the more detailed #289.