rotateXLabels( ax, angle, varargin )

Rotate x-tick labels to any angle, preserving font settings and coping with resize, zoom, pan etc

<b>NB: As of R2014b this functionality is built into MATLAB axes using the 'XTickLabelRotation' property.</b>
This function rotates the x-tick labels on a plot. An arbitrary angle can be specified for the text and the label justification adjusts appropriately to ensure the labels lie below the ticks. The axes font properties are preserved in the labels, which will update in response to font changes. Changes to the axes limits are also handled.
Main features:
* Arbitrary angle of rotation
* Justification adjusts appropriately for the specified angle
* Axes font property changes are reflected
* Labels move correctly when zooming and panning

As with other functions that achieve the same result, this works by replacing the xtick labels with text objects. Handles to the created text objects are returned for you to tinker with.