Removed redundant code to keep LLVM compiler happy.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2101 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Use fixed kNet build config and simplify kNet CMakeLists.txt.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2102 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Cleaned up commented out code.


git-svn-id: http://urho3d.googlecode.com/svn/trunk@2103 3bd170d8-ddcf-f82c-f583-7a401ccf5608
Reorganized building documentation.

git-svn-id: http://urho3d.googlecode.com/svn/trunk@2104 3bd170d8-ddcf-f82c-f583-7a401ccf5608