Add Xcode CMake output patterns to .gitignore

Closes #722.

.gitignore

@@ -13,11 +13,13 @@ Debug
 Release
 MinSizeRel
 RelWithDebInfo
+*.xcodeproj
 
 # CMake files
 Makefile
 CMakeCache.txt
 CMakeFiles
+CMakeScripts
 cmake_install.cmake
 cmake_uninstall.cmake