Added ImArray + tests.
Merge brach master

Where is the swiftzTests file coming from? I deleted it since it was
not actually there.
merge branch 'master' into ImArray
Update README for Set and ImArray, add operators.
Array literals for Set and ImArray
Merge branch 'master' of https://github.com/maxpow4h/swiftz into ImArray
Return new Array for `array`  property.
Merge branch 'ImArray' of git://github.com/tLewisII/swiftz into ImArray

Conflicts:
	swiftz.xcodeproj/project.pbxproj
moved base functions
reverted formatting changes
added tuple Eq
added better mvar test