Fix type cast bug with numpy 1.7

meshgrid upcasts float32 to float64 as of v1.7. Convert back to float32
before calling cctk.interpolate2d. The error:

TypeError: Cannot cast array data from dtype('float64') to
dtype('float32') according to the rule 'safe'
ccplot v1.4.5
Testing framework with rudimentary tests
Merge branch 'stable'

Conflicts:
	PKG-INFO
	ccplot
	setup.py
libtest: print expected value when expect failed
Add /test/work/ to gitignore
Include test scripts in source distribution
Fix test print info

There is a likely bug in PyNIO that causes it to report smaller
dimension size. Now with a custom hdf module it is the right value.
First attempt on Travis CI