Merge branch 'cornsilk_14_8_acu162901_rightlink_rc3_fixes' into v6.0
Merge pull request #390 from rightscale/ivory_14_08_acu162818_fix_concurrent_instance_state_access

acu162818 - do not use 'w' option on instance state file saving.
Merge pull request #388 from rightscale/ivory_14_08_acu163581_fix_rubygems_sources

acu163581 rubygems sources should be setup always (w-18178)
Merge pull request #386 from rightscale/ivory_14_08_acu163202_suppress_error_description_for_right_script_and_powershell_blocks

acu163202 - suppress right_script and powershell providers exec error de...
acu162167 - bump right_link version and update docs
Merge pull request #395 from rightscale/ivory_14_08_acu162167_prepare_rc3

Ivory 14 08 acu162167 prepare rc3