Change >>= operator to >>- operator. Also fix some

beta 6 issues.
Change =>> to ->> for consistency.
Merge pull request #102 from tLewisII/new_bind

Change >>= operator to >>- operator. Also fix some
State?  What State?
Docs and tests
Merge branch 'IO' of https://github.com/CodaFi/swiftz into IO

Conflicts:
	swiftzTests/ConcurrentTests.swift
	swiftz_core/swiftz_core/Operators.swift