Merge pull request #61 from cybergeek94/master

Fix error in `ImageBuf::from_fn`
Ignore Cargo.lock

See https://github.com/PistonDevelopers/piston/issues/519
Merge pull request #62 from bvssvni/master

Ignore Cargo.lock
Corrected types of variables, updated Cargo file, removed unused import
Merge pull request #64 from AngryLawyer/fix-build-errors

Corrected types of variables, updated Cargo file, removed unused import
Change to new `use foo as bar` syntax
Merge pull request #67 from lucidd/master

Change to new `use foo as bar` syntax
Added travis image
Added .travis.yml
Moved Travis CI image to heading
Add color space conversion methods to DynamicImage
fixed tests

corrected path to test images
Merge pull request #69 from Blei/conversions

Add color space conversion methods to DynamicImage