Adding Backbone pageable with search to Media Collection

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Adding setQuery as pageable prototype

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Underscore: pluck with deep objects

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Killing unneeded pagebale vars on models

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Set collection page size as default on setting query

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Adding backends search options to config

Signed-off-by: José Luis Di Biase <josx@interorganic.com.ar>
Merge pull request #15 from inaes-tic/search-view

Search view