Merge pull request #10 from BrianSemiglia/master

Concurrency added to search method.
Ensured that .m/.mm/.xib etc are being read only once and their values stored. Without this they are read by each image being checked, which is insanely inefficient and causes the CPU to become severely overloaded.
Added .gitignore.
Cleared the _fileData dictionary after all checks so that the files can be re-read in case of changes.
Merge pull request #13 from guykogus/master

Files being searched for images are only read once. Great work!
fixing merge conflicts and adding RolandasRazmas changes
making view resize properly, improving code, localizing strings, adding new css filter button
adding ~ipad in image names to the safe list for universal builds
GCD use improved with use of dispatch_group/notify. It should be noted that the use of locking negates the benefits of GCD's concurrency.