Initial commit of code.
1. Pivget looks for your PivotalTracker API token (bottom of your profile) as either the first parameter
   or as PIVGET_TOKEN env variable.
2. Following the token pivget treats all input parameters at project names
   If no project names are specified then it will get stories for all projects the Token holder has
   access to.
Create README.md
Fixed typo in error message where instruction was given to set up "PIVGET" as opposed to "PIVGIT" token.
Merge remote-tracking branch 'origin/develop' into develop