[#314,be/solr][s]: remove solr backend from core as in separate repo [1].

[1]: https://github.com/Recline/backend.solr

src/backend.solr.js

@@ -1,68 +0,0 @@
-this.recline = this.recline || {};
-this.recline.Backend = this.recline.Backend || {};
-this.recline.Backend.Solr = this.recline.Backend.Solr || {};
-
-(function($, my) {
-  my.__type__ = 'solr';
-
-  // use either jQuery or Underscore Deferred depending on what is available
-  var Deferred = _.isUndefined(this.jQuery) ? _.Deferred : jQuery.Deferred;
-
-  // ### fetch
-  //
-  // dataset must have a solr or url attribute pointing to solr endpoint
-  my.fetch = function(dataset) {
-    var jqxhr = $.ajax({
-      url: dataset.solr || dataset.url,
-      data: {
-        rows: 1,
-        wt: 'json'
-      },
-      dataType: 'jsonp',
-      jsonp: 'json.wrf'
-    });
-    var dfd = new Deferred();
-    jqxhr.done(function(results) {
-      // if we get 0 results we cannot get fields
-      var fields = []
-      if (results.response.numFound > 0) {
-        fields =  _.map(_.keys(results.response.docs[0]), function(fieldName) {
-          return { id: fieldName };
-        });
-      }
-      var out = {
-        fields: fields,
-        useMemoryStore: false
-      };
-      dfd.resolve(out);
-    });
-    return dfd.promise();
-  }
-
-  // TODO - much work on proper query support is needed!!
-  my.query = function(queryObj, dataset) {
-    var q = queryObj.q || '*:*';
-    var data = {
-      q: q,
-      rows: queryObj.size,
-      start: queryObj.from,
-      wt: 'json'
-    };
-    var jqxhr = $.ajax({
-      url: dataset.solr || dataset.url,
-      data: data,
-      dataType: 'jsonp',
-      jsonp: 'json.wrf'
-    });
-    var dfd = new Deferred();
-    jqxhr.done(function(results) {
-      var out = {
-        total: results.response.numFound,
-        hits: results.response.docs
-      };
-      dfd.resolve(out);  
-    });
-    return dfd.promise();
-  };
-
-}(jQuery, this.recline.Backend.Solr));