Added improved help for admins

Added ability to add custom X axis tick values

Feature/formatting improvements

Added ability to toggle ticks on axis

Fixed issue with grid and trend lines display

Feature/y values format number

Export png/svg now use the title as a filename

Fixed axis label position when rotated

Admin style fixes when form viewed in ctools modal

Tools to make edge case area charts work

Legend/Chart interaction toggle, Added more column override options, better structure for including default vis form widgets

Fixed settings form bug causing tick centering to be permanentlyticked

Apply opacity setting to spline chart

Feature/trend lines

Tick position and opacity option

Improved description for key selection to reduce user error when creating graphs

Visualisation updates and cleanup

Added actions wrapper and event triggers