Added DoctrineSelectableCollectionAdapter
* Updated README
* Added Tests
Install tests dependencies with composer
Added the branch alias for master
Add CallbackAdapter
Merge pull request #74 from stof/patch-1

Added the branch alias for master
tweaked callback adapter
Merge branch 'callback_adapter'
Merge branch 'composer_dev'
tweaked composer.json
enabled mongodb in travis
added php 5.5 to travis
fixed doctrine mongodb in composer.json
fixed doctrine mongodb in composer.json
added php mongo extension to travis
removed doctrine orm 2.1 from travis
removed old phpdoc
Fix SolariumAdapter to work with the latest Solarium as well
improved solarium adapter tests and set 3.* for dev
added diferent solarium versions to travis
Cache solarium result set in SolariumAdapter::getSlice()