Fix AttributeError when calling isUnlimited()

This has been fixed for some time in cdat_lite.  An example test which exposes
the bug would be as follows (assuming ncfile exists with variable 'climseas'):

def test_dimension_isUnlimeted():
    f = cdms2.open(ncfile)
    try:
        v = f.variables['climseas']
        t = v.getTime()

        # fails with AttributeError: CdmsFile.dimensions
        assert t.isUnlimited()
    finally:
        f.close()
Merge remote-tracking branch 'devel/fix_docs'
Adding test for Steven Pascoe fix
Merge branch 'pascoe_master' into add_cdms2_test
First 6 test moved
Added test names to cmakelist
Migrated more cdms2 tests
Fixed test 08
Got all test going
Merge branch 'add_cdms2_test' into release