Modifying query module to allow to compare by multiple keys in gt,lt,gte,lte queries
Modifying lookups module to allow to compare by multiple keys in gt,lt,gte,lte queries in django 1.7
adding test case for lt queries
code formatting
adding documentation for gt/e-lt/e filtering on multiple fields
Merge pull request #55 from chelis/query_multiple_keys

support comparing by multiple keys in gt, lt, gte, lte