Merge pull request #199 from christeredvartsen/develop

Allow /metadata for the meta data resource
Remove the usage of APC and try to build on PHP-5.5
Remove 5.5, and skip installing packages using apt-get as most of them seem to be already installed
Use the Memcached adapter instead of the APC one for the Behat test suite
Enable 5.5 again
Merge pull request #200 from christeredvartsen/travis-ci-php-5.5

Remove the usage of APC and try to build on PHP-5.5
Added an index resource along with docs and tests
Added a URL for issues
Added an entry in the ChangeLog
Merge pull request #201 from christeredvartsen/index-resource

Added an index resource along with docs and tests
Fetch added and updated timestamps from the image object if they exist
Made the database tests run quicker
Added a fields property that will be used by formatters to choose which fields from the model that will be displayed
Set the fields in the model if a fields query parameter is present
Use the fields property to filter fields
Added a scenario for the fields query parameter
Added a note regarding the fields query parameter
Updated the ChangeLog
Merge pull request #204 from christeredvartsen/choose-fields-to-display

Images resource should be able to retrieve only specific fields
Updated ChangeLog