Minor spelling issues in line-chart's documentation

Minor spelling issues(was issue #452)
Merge pull request #453
Box plots with no data no longer attempt to draw with NaN values at the top of the graph
Refactored boxplot NaN fix not to use public preRedraw listener + disabled elasticX by default
Pushed line chart specs testing coordinate grid mixin functionality into coord spec. Removed equivalent bar chart tests.
Merge pull request #458 from pivotalforks/bar-chart-test-to-spec

Coordinate grid / line chart spec refactoring
Merge pull request #445
Merge remote-tracking branch 'upstream/master'
added optional right aligned title label to rowChart. _chart.renderTitleLabel