Add spline custom interpolation

Corrected "lable" typo in some text labels

Change legend method customization to be consistent across all methods

Bugfix 1292, 1246 by making subchart axis hidden if subchart is hidden

Fix #1225 - (0.4.11-rc1) Incorrect layout when using titles on charts that are not visible at generation

Fix #1229 - Incorrect x tick positioning

Remove moot `version` property from bower.json

With these changes it is possible to set a custom spline interpolation
by giving a valid d3 interpolation to spline.interpolation.type.

Fixes #479

Use getTextRect to measure title size, also fix getTextRect so that any custom css font used is applied while measuring

Per bower/bower.json-spec@a325da3

Add the ability to prevent elements from the showing up in legend and tool-tip

Enforcing the AMD factory standard

Add chart.api ($$.api) to 'onunselected' callback

Patch for #1141

Update tooltip.js