mpl2

[marqh]

there is a potential bug with respect to matplotlib2 in tick locations

the version of mpl is now pinned, pending this fix

https://github.com/SciTools/nc-time-axis/blob/master/nc_time_axis/tests/unit/test_NetCDFTimeDateLocator.py#L99
https://github.com/SciTools/nc-time-axis/blob/master/nc_time_axis/tests/unit/test_NetCDFTimeDateLocator.py#L107
https://github.com/SciTools/nc-time-axis/blob/master/nc_time_axis/tests/unit/test_NetCDFTimeDateLocator.py#L111

ref #22

[QuLogic]

There are two problems. Firstly, MaxNLocator changed with mpl2; tests could maybe be fixed by setting classic style first. Secondly, this code supplies invalid steps; it should start at 1 and end at 10 (as specified in the MaxNLocator docs).

[marqh]

thanks for the tips @QuLogic