Add support for Cytoscape Filters

[dotasek]

Cytoscape Filters currently have no support in CyREST. Their format is actually JSON, so this would be a good opportunity to use existing formats.

[ { "name" : "Default filter", "transformers" : [ { "id" : "org.cytoscape.CompositeFilter", "parameters" : { "type" : "ALL" }, "transformers" : [ { "id" : "org.cytoscape.ColumnFilter", "parameters" : { "predicate" : "BETWEEN", "criterion" : [ 1.0, 16.35887097 ], "caseSensitive" : false, "type" : "nodes", "columnName" : "AverageShortestPathLength" } } ] } ] } ]