added Filter objects to support filter changes

- fixed a bug on design view url
- added Filter Class, Filter Object and adapted RowSet to recognize
  filter attributes.
added filter.js to test
added placeholder for testing view and filter, currently failing
due to not returning values which are already assigned.

performed this on ipython and its working fine, tried relaxing
timing but not successful. Will need to take a look here again.

commiting this for now as a beta feature version.
Merge branch 'feature/filters' into develop
bumped to 0.10.3

- beta release on filters
Merge branch 'release/0.10.3'