added axis labels
Change buttons into a drop-down menu with check boxes
change hover to display only month year (e.g. Mar. 2007, rather than 2007/03/01)
Do not display empty period of record (in montly flow data) at the beginning of the reach record if it exists
Implemented fixes from code review with Ivan.
Merge branch 'master' into dygraphTweaks

Conflicts:
	glri-afinch-web/src/main/webapp/css/custom.css
Merge pull request #39 from cschroed-usgs/dygraphTweaks

Dygraph tweaks