changed annotations referenced to data to mimic mpl alignment.

[theengineear]

In response to (4) in #46

[etpinard]

This appears to work fine.

Off the mpl-annotations branch:

dataviz1 = plt.figure(...)
# ...
py.plot_mpl(dataviz1, resize=False)

yields https://plot.ly/~etpinard/341

dataviz1_get = py.get_figure("https://plot.ly/~etpinard/341")
[dataviz1_get['layout']['annotations'][i]['xanchor'] for i in range(3)] # --> ['left','left','left']

The question now becomes if and/or how to automatically increase the margins to make annotations like theses fit in the figure's frame?

Note that we could also increase the range (in this case, the x-axis' range) to make the annotations fit. But, this is probably not the best solution.

[theengineear]

Well, i'll be getting the frame to go away there at least... it's extremely difficult to track down whether or not the ticks are set to be on or off so far. But i'm pretty sure i'll be able to track that down soon.

In other words, we wouldn't need to increase the side of the data area if the frame wasn't showing in that plot.

[theengineear]

this is pretty related to (#53), i'm going to merge this so annotations are all set.