Merge pull request #28 from admire93/master

Refactoring Edge.find with MetaQueryBuilder
Modify date field to store milliseconds
Add test case for milliseconds
Export to Edges controller and support limit, offset
Apply meta query builder to Edge.find
Add Edge.count
Add parameter for limit, offset pagination
Add test case for limit, offset
Merge pull request #29 from mintpresso/support-milliseconds

Support milliseconds and close #8
Merge pull request #30 from mintpresso/edge-limit-offset

Edge limit offset and close #10