.gitignore:Added files/directories to ignore on OS-X build.

.gitignore

 build/linux/release/lib
 build/linux/release/include
 
+build/osx/debug/src/
+build/osx/debug/bin
+build/osx/debug/lib
+build/osx/debug/include
+build/osx/release/src/
+build/osx/release/bin
+build/osx/release/lib
+build/osx/release/include
+build/osx/debug/[123456789]*
+
 #Files to ignore
 *~
 *.[oa]