Integrated customizable bash prompt
crowbar_join: Disable chef reporting

This is a feature specific to Chef Enterprise, and is causing this line
in chef logs:

HTTP Request Returned 404 Not Found: No routes match the request: /reports/nodes/d52-54-00-00-00-01.site/runs
Merge pull request #327 from tboerger/feature/shell-prompt

Integrated customizable bash prompt
Merge pull request #328 from vuntz/disable-chef-reporting

crowbar_join: Disable chef reporting