nadavfima/ChartView — pull request #2 by isaacseymour (2013-08-22 11:15:09+00:00)
Title: Labels can be placed on an arithmetic sequence as well as at fixed intervals on screen

Added properties `gridLineXGap` and `gridLineYGap` which place grid lines at their integer multiples in the data, as an alternative to a fixed number of grid lines.

Also switched AbstractSeries from using a `List` to a `SortedSet`, as this avoids re-sorting on every draw, and some general code tidy up and extra commenting.