Initial import from upstream SVN rev 517
Cleanup project

* Make this a proper Android library project
* Update build target and target SDK to 17
* Remove demo
* Remove libs
* Remove maven / ant files
* Remove package.html files
* Remove empty folders
Add ConnectedCharts and dependencies
Add drag handles to overview chart
Add CombinedTimeChart and make it default for ConnectedCharts
Make OverlayChart and MoveHandler adjust to screen density
Add support for multiple scales
Adjust x axis pan limits to using a TimeSeries
Some refactoring
Enable changing overlay color
Don't crash if there are not enough points for drawing an OverlayChart
Move ConnectedCharts from library to project
Remove custom date type from CombinedTimeChart
Remove leftover icons from demo
Extend point styling options
Slight change to x axis date format
Add RangeOverlayChart
Set max zoom in level to one day (hard coded)
Fix copy-and-paste error
Don't update RangeOverlayChart once it's been initialized