References issue #2, improved error messages when a dependency is not found
- if the dependency check fails, we now tell you whether it was Xcode, codesign or codesign_alloc which was the culprit
Refs issue #3, attempted to add some constraints to drop view
Resolves issue #2, fixed error where dependencies weren't found if Xcode 5 was installed
The sub folder where codesign_alloc is stored in the Xcode5.app
directory structure is different in Xcode5. An additional check for the
new location was added.