Merge pull request #156 from bvssvni/master

Upgrade to latest Rust
prepare publishing on crates.io
Merge pull request #157 from nwin/master

prepare publishing on crates.io
first published version on crates.io
Merge pull request #158 from nwin/master

first published version on crates.io
Adding basic TGA support
Merge pull request #159 from juxiliary/master

Adding basic TGA support
re-enable tests for travis
Fix tests, create output directory.
Excluded tests and examples from package.
Merge pull request #161 from nwin/master

Some fixes
Be a bit more thrifty with unsafe {}
Merge pull request #162 from nwin/master

Be a bit more thrifty with unsafe {}
Remove unwraps in non-testing code
Initial support for interlaced images (still fails on some reference images)
Merge commit '71d3b0d29f8b14bfc885c861902a55a5f376f996'
remove tabs
Merge pull request #164 from nwin/master

Initial support for interlaced PNG images
Improve docs, mention possible panics.
Merge pull request #166 from nwin/master

Improve docs, mention possible panics.