Implement historical finance data from Google Finance
This looks pretty cool! Good to have something in the docs / release notes.
 If this is OK to be merged, I can update the docs (and I might need some help with the release notes)
 It looks pretty good to me, will see what other people think, but ti seems to work.

(I tagged it for consideration for 0.11.1).
 Merged. I'll add a release note
 @gliptak see here for a possible bug...https://travis-ci.org/cpcloud/pandas/jobs/8040142
 Caused this build to fail too (with the same error I guess) ... https://travis-ci.org/jtratner/pandas/jobs/8035403
 @cpcloud  @jtratner please see #3893
