Simplify import

[csemken]

Currently, the import for Stargazer is unnecessarily convoluted:

from stargazer.stargazer import Stargazer 

I suggest we simplify it to:

from stargazer import Stargazer 

Which can be done by adding the following line to __init__.py:

from .stargazer import Stargazer 

This change is backwards-compatible.

[toobaz]

@csemken I certainly was planning to do this. But maybe it would be a good occasion to apply #44 - hence not just doing a transparent import, but really creating a new initialization class (with the idea to deprecate the older API, and hence the from stargazer.stargazer import Stargazer, in the long term).

Thoughts? (also @MaxGhenis @mwburke )