Simplify @uses in tests.
CS fixes in tests.
Update travis to match other CG libraries, test HHVM.
Add build indicator to the readme
Namespace fixes, docblock tweak.
Use int instead of integer in docblocks, to match Symfony conventions.
Test cleanup.

- Fix order of arguments to $this->assertEquals().
- Fix indentation in the NumberFormatterTest.
Make the NumberFormatter $style validation less fragile, fix exception message.