Use latest SDK instead of 10.7

10.7 is no longer available in Xcode 6
Only include actual source from Podspec

The previous glob caused a demo file from Ace to be included in the
build.

ACEView/Dependencies/ace/demo/kitchen-sink/docs/objectivec.m
Merge pull request #23 from mhallendal/fix-podspec

Only include actual source from Podspec
Merge pull request #22 from mhallendal/use-latest-sdk

Use latest SDK instead of 10.7
Bump Ace to 1.1.7