Guard around dispatch_resume() being called with null pointer, as warned by the static analyzer.
Add .DS_Store to .gitignore
Merge pull request #110 from rivera-ernesto/master

Add .DS_Store to .gitignore
Fixing issue #101 : Colors in greyscale color-space do not work
Updating sample code to test grayscale color customization
Merge pull request #107 from realestate-com-au/master

Guard around dispatch_resume() being called with null pointer, as warned by the static analyzer.