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: I8384b1598e48faca6741466a5e39f3f54258441a
Merge pull request #14 from manojgn/feature-dev

Bucketization changes: