Capture output from `tail` and run it through NSLog
Capture output from `tail` and run it through NSLog

This avoids xctool dying on unexpected output.

See facebook/xctool#244.

EdZava/Squirrel.Mac,emiscience/Squirrel.Mac,EdZava/Squirrel.Mac,EdZava/Squirrel.Mac,emiscience/Squirrel.Mac,Squirrel/Squirrel.Mac,Squirrel/Squirrel.Mac,Squirrel/Squirrel.Mac,emiscience/Squirrel.Mac