add name method for Variable, Dimension and Group instances, print numpy
version when running tests.
changed name method to property
include fix for issue #301 (pull request #302)
change 'name' attribute to 'long_name', since 'name' is now a
property...
Merge pull request #298 from jswhit/master

add name method for Variable, Dimension and Group instances, print numpy
Fix for issue 301 (stripped string after since to remove leading spaces)