implements nvm which
forgot to append bin
adding some tests for nvm which
remove redundant lines from test file
include nvm which in documentaiton
change to use default behavior for which
style and remove nvm deactivate in nvm which
fix to proper echo of nvm which.  Checkin test which had been left out
merge with master
Merge pull request #583 from danielb2/which

Adds `nvm which`