DDF-2070 Remove backbone relational and replace with backbone associations
* Replaced Backbone.Relational models with Backbone.Associated models
* Various improvements to async calls for deletions
* Corrected templates to work with new data models
DDF-828: Made mime type registration dynamic in the TikaInputTransformer.

    - Added tika to dependency management
DDF-913 updated solr clients to handle the filter order change correctly when secured
DDF-915  upgraded commons-fileupload to v1.3.1 to address security vulnerabilities
Merge pull request #39 from jeremyglasser/feature/DDF-2070-change-to-associations

DDF-2070 Remove backbone relational and replace with backbone associations
DDF-894 Added propertyIsNull support to the SolrFilterDelegate

-kind of odd to get this to work.  First you come in without a field type so we have to do so using the getAnonymousField() method.  Than we have to use the negative queries to actually get the results we need. (*:* -fieldName:[* TO *]) is the magic sause to get this to work.  For details on how this works, visit the url below.
-http://stackoverflow.com/questions/17044661/how-to-filter-search-by-values-that-are-not-available/17045097#17045097
Merge pull request #38 from McLucas/feature/DDF-894

DDF-894 Added propertyIsNull support to the SolrFilterDelegate
DDF-922 Add empty view for sources.
* Add empty view to allow for display message when no federated sources are configured in the application.