adding updated logo and testing out travis build

[vsoch]

This quick PR will (possibly unwisely!) try to do two quick changes to:

• update the logo from Add a logo for the python package?  #4
• update the travis.yml to only build master (and possibly this will work with the backend settings on travis so the PR will build still?

What we'll need to do after merge is update the README.md to have absolute links to the files, that way they will render cleanly in the next pypi release (relative paths do not).

Signed-off-by: vsoch vsochat@stanford.edu

[codecov]

Codecov Report

Merging #5 into master will not change coverage by %.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master       #5   +/-   ##
=======================================
  Coverage   72.56%   72.56%           
=======================================
  Files          15       15           
  Lines         452      452           
=======================================
  Hits          328      328           
  Misses        124      124           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 93d7fcb...a0146aa. Read the comment docs.

[vsoch]

Let's wait on discussion in #4 to make sure the colors are consistent (I can update the files here!) And either way, looks like the Travis issue was an easy fix!

[vsoch]

okay, colors will do for now. Merging!