Merge pull request #1 from NickQiZhu/master

rebasing my fork
added option to enable brush rounding for centered bar chart
updated fluctation and volume charts to always use rounding
cleaned up docs
Merge remote-tracking branch 'upstream/master'
added optional right aligned title label to rowChart. _chart.renderTitleLabel
Merge pull request #462
Merge pull request #459
Converted bar chart tests to specs + line chart spec improvements