BUG/VIS: rot and fontsize are not applied to timeseries plots

[sinhrks]

In some plots, rot and fontsize arguments are not applied properly.

• timeseries line / area plot: rot is not applied to minor ticklabels, and fontsize is completely ignored. (Fixed to apply to xticklabels)
• kde plot: rot and fontsize are completely ignored. (Fixed to apply to xticklabels)
• scatter and hexbin plots: rot and fontsize are completely ignored. (Under confirmation)

import pandas as pd
import numpy as np

df = pd.DataFrame(np.random.randn(10, 4), index=pd.date_range(start='2014-07-01', freq='M', periods=10))
df.plot(rot=80, fontsize=15)

Current Result

After Fix

[sinhrks]

The problem affects to kde, scatter, and hexbin plots. These all ignores rot and fontsize now.

In kde, I think it is natural to use rot and fontsize for xticklabels. But in scatter and hexbin, maybe better to apply to both xticklabels and yticklabels? Or only to xticklabels?

[jreback]

@sinhrks thanks....