Getting Started - environment

[Patricia Shanahan]

The Getting Started page does not say what sorts of environments work. I 
started using cygwin on a Windows 8.1 machine with 
RIVER_HOME='/cygdrive/c/Documents and Settings/Patricia/Downloads/River'

That does not seem to be working well, because of the embedded space.
Do we need to require a directory without spaces in its full path?

Patricia