Add storyboard support.

Add ibtool support for storyboards.  Storyboards also seem to flex an issue
in ibtool where relative paths cause weirdness.  Xcode passes absolute paths
to ibtool, so changing to abs paths here as well.

BUG=314728
R=pkl@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/51103013

git-svn-id: http://gyp.googlecode.com/svn/trunk@1778 78cadc50-ecff-11dd-a971-7dbc132099af
ninja/mac: Let mac_bundle_resources keep file permissions.

Also add a test that this is true for 'copies' too.

BUG=chromium:315383
R=mark@chromium.org

Review URL: https://codereview.chromium.org/61293004

git-svn-id: http://gyp.googlecode.com/svn/trunk@1779 78cadc50-ecff-11dd-a971-7dbc132099af