Added VC11 sln/projects + added some missing configs

Overview:
 - Added solution, project, and filter files for VC11
 - Added some VS2012-generated files to gitignore (e.g. tlog, sdf etc.)
 - Added missing solution configs: debug-noboost-dll and release_noboost-dll
 - Activated multithreaded build because it works fine and much faster in VC11
 - Enabled pdb generation for these new projects

Limitations:
Up to now, the build has only be made run and tested for the stuff we need for our product, i.e.
 - Only the new configurations debug-noboost-dll + release-noboost-dll
 - Only with 64Bit
 - Only assimp and assimpview