Merge pull request #58 from DeuxHuitHuit/integration

Fixes for #55 and #56
Check if there are recipes before attempting to save them
Merge branch 'integration' of github.com:symphonycms/jit_image_manipulation into integration
Improved README for external images
Release 1.17
Fix potential warning when checking trusted sites
Cache Gateway requests if possible for better performance
Check recipes with regular expression rather than strpos. Fixes #63. Code cleanup for clarity (mode detection)
Use PHP_EOL instead of \r\n when saving .htaccess and recipes to disk. RE: #9
Match thumbs better, so you have use thumb or thumbs for example. Fixes #63
Set GD to ignore invalid JPEGs
Merge pull request #64 from vlad-ghita/patch-2

Set GD to ignore invalid JPEGs
Release 1.18
Added Finnish translation.
Changed the wording
Update links to the getsymphony.com domain