Bucketization changes:
1. Reorganized the code making  bucketization params configurable from chart options
2. Max scatter level and No. of buckets is now configurable
3. Bucktization reset now working (css modification pending)

Change-Id: Icf80a0cc2e5e13ff8400abddc3266522012cb858
Merge pull request #12 from manojgn/feature-dev

Bucketization changes: