UPDATED: README.md

FIXED: build error when corss compiling for Mac OS X

FIXED: added missing mac deploy files

UPDATED: version bumped to 1.2.0 and further cleanups

FIXED: Mining reward to low for transaction check

UPDATED: corrected log message

FIXED: removed wrong stake modifier checkpiont and added a valid one …

…at height 10661

updated README.md with build instructions