Fixed logformatting for non integer bases.

[pelson]

Fixes #909.

[pelson]

This is not true:

$> grep -ir decadeOnly *
Binary file doc/build/doctrees/api/ticker_api.doctree matches
doc/build/html/api/ticker_api.html:<p>if attribute <em>decadeOnly</em> is True, only the decades will be labelled.</p>
lib/matplotlib/ticker.py:    if attribute *decadeOnly* is True, only the decades will be labelled.
lib/matplotlib/ticker.py:        self.decadeOnly = True

[pelson]

This is a small-ish change if anyone is prepared to go over it?

[WeatherGod]

I don't like how you do the string formatting of the 'b' variable separately from the formatting of the rest of the label. Why not do the string concatenation of the needed format string for the base and then do all the formatting at once?

[pelson]

I agree that it is a little awkward to follow. I'm not seeing your suggestion though, do you mean make base be either "%s" or "%d" and then use that for the string interpolation later on?

[WeatherGod]

Yes. Do all the string formatting at once.

[pelson]

Ok @WeatherGod, I think this resolves your concern.

[mdboom]

Looks good to me. Feel free to merge.

[WeatherGod]

Right, thanks for that. Merging...