acu135785 refactor functional specs

Pretty much prevents this intermittent error:
       Error: HTTP Code: 422, Response body: [["name","A deployment with this name already exists. Please enter a different name."]]
acu135785 update rconf
acu135785 add information about last_request in README.md

This existing functionality was never documented :(
Merge pull request #42 from rightscale/salmon_13_17_acu135785_add_current_url

Salmon 13 17 acu135785 add current url