Change Bitcoin->MasterCore in Mac OS X places

Changes from Bitcoin to MasterCore in filenames, UI strings, etc. Necessary to build Master Core properly for OS X.
Merge branch 'msgilligan-msc-osxbuild' into omnicore-develop
Workaround for build issue on my system

(This is a hack and the correct fix is probably a reinstall of all the
dylib dependencies with HomeBrew)

The issue is that libboost_system.dylib is a direct dependency and is
being correctly included, but libboost_system-mt.dylib is showing
up as an indirect dependency and breaking the deploy script (file not found)

(cherry picked from commit 050fe3811339a13db1b2e6ced67bb4299355422d)