Merge pull request #7 from ldecicco-USGS/master

Response to reviewer's comments.
Merge pull request #8 from ldecicco-USGS/master

Added travis.
Update README.md
Remove travis thing until I figure it out.
Updated readme with appveyor.

Merge branch 'master' of github.com:USGS-R/dataRetrieval

Conflicts:
	README.md