Update tests to compile on Xcode 6.1.
Merge pull request #31 from nschum/xcode61

Update tests to compile on Xcode 6.1.
Add explicit return statements to examples

See #9
Fix sample code in readme so it compiles
Merge pull request #34 from brandonroth/bug/readme

Fix sample code in readme so it compiles
Remove constrain replacement
Fix addConstraint to not trigger layout
Rename to constrain
Use constrain in specs where appropriate
Merge branch 'master' into refactor

Conflicts:
	CartographyTests/DimensionTests.swift
	CartographyTests/EdgeTests.swift
	CartographyTests/OperatorTests.swift
Merge branch 'refactor' of https://github.com/robb/cartography into refactor