Added math functions to denormalize regressions.
Merge remote-tracking branch 'upstream/master' into jpAmster
Linear regressions now work for timeline, at the cost of most other regressions.

Merge remote-tracking branch 'upstream/master' into jpAmster
Merge remote-tracking branch 'upstream/master' into jpAmster
Merge remote-tracking branch 'upstream/master' into jp1299
Merge remote-tracking branch 'upstream/master' into jp1299
Issue 1299 has been address by restricting users temporarily to linear regressions on timeline.  Scatter plot regressions should just work for now.  I'm still working on this but I wanted this stable version pulled up.
Merge pull request #1355 from jaypoulz/jp1299

Timeline now supports linear regressions.