Merge pull request #39 from ldecicco-USGS/master

Overhaul of function names. Move some functionality to EGRET.
Update README.md
Changing to version 2.0.0
Took out examples to pass the time requirements for package checks on CRAN.
Fixed a couple bugs.
Latest build.
Merge branch 'master' of github.com:USGS-R/dataRetrieval
Readme updates.