Merge pull request #1307 from ReactiveCocoa/bump-deployment

Bump OS X deployment target to 10.8
Merge pull request #1312 from ReactiveCocoa/update-build-scripts

Update build scripts
Merge branch 'master' into 3.0-development
Fix deprecated methods used in tests merged from master
Merge remote-tracking branch 'origin/3.0-development' into subscribe-to-this-newsletter