first put it back on by default
removed all (most?) temporary object created, create only absolutely necessary one

animation now seem to not slow down (still not super fast)
Merge branch 'master' into issue_animations_slowing_down
new pngs I think having less copies of templates rsulted in slightly shifted templates
forgot to replace everywhere create_random_template
more corrected pngs
all tests pass now
had the labels gone, need to regenerate pngs pix
reverted most images
one little typo
MAJOR bug fix xvsy was flipped
new baselines
merged master in this to get better baselines
removed print statements
removed beta from version number
Fix slice value thresholding
fixed issue where I was using linesize instead of linewidth
Fix rotation/alignment issues in text. Ref #503

VTK has some oddball quirks for backwards compatibility -- this is one of
them. In a nutshell:

vtkTextProperty::SetOrientation: Rotates the text in the texture produced
by the text-rendering backend in VTK.

vtkTextActor::SetOrientation: Rotates the texture around the anchor point.

So previously the text was rendered at an angle to an oversized
rectangular texture, which was then aligned to the anchor-point, leading
to the unexpected results.
Merge pull request #756 from UV-CDAT/issue_animations_slowing_down

Issue animations slowing down
added function on time axes to return themselves as list of datetimeobjects