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
Added infix function composition operator

`….` is maybe not the best, but we can’t do `.` and `..` and `…` are
for ranges
Ambiguous type fix
More test fixes
Yet another test fix
IxStore and lens revamp
Merge pull request #33 from tLewisII/func_comp

Added infix function composition operator
formatting
Merge pull request #35 from pthariensflame/topic/ixstore

Indexed store; lens revamp
added dictionary mapValues
Replace pthread in Future with GCD
Return new Array for `array`  property.
Fixed mapValues
Merge pull request #37 from rnapier/future

Fixes #36. Replace pthread in Future with GCD
added value getter to box