Tested args and start_plot method.
Merge branch 'master' into feature/charts_tests
Added tests for add_data_plot and end_plot methods.
Completed (almost) Chart testing.
Added testing of ChartObject and modified previous test to use a setUp'ed chart/chartobject example.
Merge branch 'master' into feature/charts_tests
Commenting out dummy test to avoid spurious test count.
Merge pull request #1106 from ContinuumIO/feature/charts_tests

Feature/charts tests