Use PSR-4

- Allows for a flatter package structure
- Allows us to easily move PHPUnit configuration to package root
Added Travis toolchain

- Adds CS fixes, and Coveralls support
Update phpunit invocation for Travis

- No longer need the `-c ./test/` directive.
Fix test bootstrap autoloading

- Modified Bootstrap::initAutoloader() to use PSR-4-style autoloading.
Add travis and coveralls badges
Merge branch 'hotfix/psr-4'

Close #17