[Svn] Fix Subversion 1.8 crashing whenever you open a solution.
[Subversion] Fixed coding style. Added readonly modifier and consistent overload naming.
[Subversion] Fixed issue with Apr lib being null.
[Subversion] Fix 1.7 and 1.8 for Unix.
[Subversion] Fix Unix UnitTests.
[Subversion] Try and fix NREs caused by lib loading.