Added MacSystemProfiler, minor changes

- Added MacSystemProfiler class to Additional Modules.
- Added Carbon.VersionAsInteger to standardize version-to-integer
conversions. (Moved code from SystemVersionAsInt.)
- Mofied Carbon.SystemVersionAsInt to use Carbon.VersionAsInteger. No
change in functionality.
- Added Carbon.IsMountainLion.
- Modified MacPListBrowser.
Fixed typo in release notes
Merge pull request #19 from ktekinay/master

Added MacSystemProfiler, minor changes
Merge pull request #10 from macoslib/master

Merge