Allow partial collection name in white list

With this patch it will be possible to specify partial collections name in the collections white list array
I need this patch in order to allow queries on collections suche as `ck_foo` and `ck_bar` by specifying by using a white list array such as `['auths', 'ck_']`
Added RegExpo possibility in collections whitelist
Merge pull request #7 from mattbrun/master

Allow partial collection name in white list with RegExp capabilities