add 40.10 osx layout
Merge pull request #146 from fricy/DF2014

add 40.10 osx layout
Update README.md
Use qmake builtin debug_and_release.
Remove OS-specific entries from .gitignore.

.gitignore should only store items that are generated by the code in the
repository. If your operating systems generates temporary files, put
those in your .gitignore_global.