v255.3

Improvements:

• switch from director.env.* to env.* for setting HTTP proxy
• show assigned AZ for compilation VMs
• better error message when a static IP is in a reserved range

Incomplete (continued working on...):

• switching to instance_groups terminology
• bosh attach disk command
• UAA deployment level permissions (teams)
• backup and restore functionality for the Director DB

Dev:

• bumped bundler to 1.11.0

This release includes 3202 stemcell series.