Support for OS X 10.7 Lion and 10.8 Mountain Lion

I've rebuilt Tesseract and Leptonica for OS X in a way that should be compatible with older versions of OS X. This means that the HearthStats.net-Uploader should work on any Mac [that can play HearthStone](https://us.battle.net/support/en/article/hearthstone-system-requirements). The requirements for the OS X version of HearthStats.net-Uploader are now:
* Java 7+
* OS X 10.7+ (ie Lion, Mountain Lion or Mavericks)

Note that I haven't been able to test that this version actually works on Lion or Mountain Lion... I don't have a Mac with those versions. It might be good if someone can test this on a Mac with Lion or Mountain Lion before release.