Typo & uppercase for FALSE, NULL etc.
Welcome 5.5.17.

See README for changes.
Updated .gitignore, added .gitkeep, removed PHP-IMDb-Grabber-Cache file.
Updated to 5.5.18

- The latest pull request I merged broke the caching. Sorry guys, I'll
never ever pull a request that easily.
- Added caching for getFullCast().
- Minor code changes.
Merge pull request #1 from FabianBeiner/master

update