Tuned post filter (again)
Merge pull request #75 from learn-more/master

Warnings & C++11
Merge branch 'master' of https://github.com/yvt/openspades

Conflicts:
	Resources/Shaders/PostFilters/LensDust.fs
Fix build with GCC
Update .gitignore
Merge pull request #77 from ShadowNinja/update_gitignore

Update .gitignore
Merge pull request #78 from ShadowNinja/gcc_fix

Fix build with GCC