Move to nifty 0.6.0 for swift 0.6.0 release
Move to nifty 0.6.0 for swift 0.6.0 release

rojanu/swift,karryoberes/swift,coderczp/swift,electrum/drift,airlift/drift,electrum/swift,glybuaa/swift,dain/swift,glybuaa/swift,karryoberes/swift,alandau/swift,dain/swift,adriancole/swift,coderczp/swift,electrum/swift,andrewcox/swift,bgould/swift,andrewcox/swift,bgould/swift,adriancole/swift,dain/drift,rojanu/swift,facebook/swift,facebook/swift