++RAC to v2.2.4
++RAC for +rac_sendAsynchronousRequest: fix
++RAC for xcconfigs bump.
Merge pull request #21 from ReactiveCocoa/xcconfigs-bump

Bump RAC for xcconfigs updates.
Add a workspace for standalone development.
Bump RAC.
Pull dependencies from the workspace.
Scheme version bump.
Bump RAC.
Document workspace/xcodeproj getting started stuff.
Bump RAC.
Merge pull request #22 from ReactiveCocoa/flatten-dependencies

Flatten dependencies
++RAC
++RAC
Merge remote-tracking branch 'origin/master' into rac-3.0