Fix explicit import of Mantle's value transformer.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Change EXTKeyPathCoding to use RAC version.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Remove libextobjc Xcode group.

Signed-off-by: Aron Cedercrantz <aron@cedercrantz.se>
Merge pull request #73 from rastersize/fix-value-transformer-import

Fix explicit import of Mantle’s value transformer.