Update composer.json

Revert "Merge pull request #6 from dpfaffenbauer/master"

This reverts commit cc603bd, reversing
changes made to 8232954.

Merge pull request #6 from dpfaffenbauer/master

Update composer.json to use alpha version of omnipay/common

Merge pull request #4 from delatbabel/update-docblocks

Update docblocks, add makedoc and runtests scripts

Update .travis.yml

PSR-4

Update dependencies