Bumping version numbers and setting MASTER to False for release
Updating version.txt for release
Add retriever to system path not user path

In some cases adding to the user path will not allow the retriever to work
from the command line.
Remove Download Only scripts from version.txt in master

This is to prevent breaking the previous release since it was released
with MASTER = True and therefore tries to install the scripts in the
master version.txt

See #208 for more details and #180 and #199 for examples of this breaking.