Merge pull request #11 from pierreinglebert/master

Add support for Node.js v0.11+ via nan. Remove epeg test dependency as it fails to compile on v0.11+.
Support Node.js v0.10+ only. Add @pierreinglebert credit.
Merge pull request #14 from pierreinglebert/feature-magickloader

Add support for many other input files via the *magick libraries
Move fixtures to a proper directory
Add test for gif (libmagick)