small refactor in models/deployment
destroy --> destroy! to force exception
fix cost formating in deployment and instance properties
API: Instances index, show, and entrypoint
API: Show full representation of instances in top level collections
Removed use of locals in show action
Merge pull request #290 from rwsu/instances-api

API: Instances index, show, and entrypoint v3
Merge pull request #282 from martinpovolny/cost-format

fix cost formating in deployment and instance properties
Changed cucumber user test

For some reason when running rails 3.2.8 with ruby 1.8 on travis,
validation if password is blank returns only message:
Must be a unique password with at least 4 character and at most 255 characters.

Although the test passes unchanged for ruby 1.9.

(cherry picked from commit 3bebbdd3e98023164d2ede1d96c92851e6724fba)
Merge pull request #296 from jistr/fix_travis_ruby18

Fix Travis 1.8 cucumber
Merge pull request #222 from martinpovolny/deployment-refactor

small refactoring in models/deployment