Merge pull request #394 from rightscale/ivory_14_08_acu162167_prepare_rc3

acu162167 - bump right_link version and update docs
acu161748 Make sure rs_tag api errors bubble up
acu161748 - iterate on review. Revert error_output for adding a tag (by design) and update specs
Merge pull request #400 from rightscale/ivory_14_08_acu161748_rs_tag_error_status

Ivory 14 08 acu161748 rs tag error status