Merged grunt copy task targets
Reformatted grunt task configs

Got rid of the ridiculous indentations and property alignments
Updated build system: added win64 and osx64 builds

Renamed/added targets for the `compile, dist and release` grunt tasks:
win,windows -> win32,win64
osx,mac     -> osx32,osx64
linux       -> linux32,linux64
x86,32      -> win32,osx32,linux32
x64,64      -> win64,osx64,linux64

Added grunt tasks targets:
clean:dist, clean:cache, clean:releases