Don't alter casing if the file pattern is lowercase
Don't alter casing if the file pattern is lowercase

Closes ggreer/the_silver_searcher#744.
Arkanosis/the_silver_searcher,Arkanosis/the_silver_searcher,Arkanosis/the_silver_searcher,Arkanosis/the_silver_searcher,Arkanosis/the_silver_searcher