Merge pull request #4 from kvark/master

Transform is enabled, improvement, and implemented for a struct
change float to f64
Merge pull request #6 from JeffBelgum/tests

change float to f64
Merge branch 'master' of https://github.com/kvark/cgmath-rs into kvark-master

Conflicts:
	src/tests/plane.rs
	src/tests/vector.rs
Run tests with Travis CI
Add build status icon to README
Merge pull request #7 from bjz/travis

Run tests with Travis CI
Transform::concat implemented