Add tooltips for line charts

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
County Choropleths not displaying tooltips.

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>

Conflicts:
	widgets/src/map/ChoroplethCounties.js
Merge pull request #106 from GordonSmith/ChoroplethCountiesTooltips

County Choropleths not displaying tooltips.
Merge pull request #107 from GordonSmith/LineTooltips

Add tooltips for line charts
Enable resizing of widgets within Graph Widget

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>

Conflicts:
	widgets/src/map/ChoroplethCounties.js
Add ability to save and restore dashboard layouts.

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>