Adds basic montly view
Add datagrid widget for montly view

The datagrid is designed to be standalone but has only been
tested for the montly view use case. It displays data in a
bootstrap styled table.

The datagrid allows for CRUD operations on the data in the table.
Through callbacks the operations can be made to connect with a backend.
Merge pull request #23 from stenbacka/crud-montly-view

Crud montly view