Move actions to lib/ey-ss-a/action/ to separate from helper classes

Backwards compatible constants are created as well
Add CommandOptions class to contain all options
Refactor how arguments are accepted within actions.

Instances argument is no longer special.
Tweak rspec output format
Add --ignore-existing to integrate action
Merge pull request #9 from engineyard/refactor-options

Refactor options and add now --ignore-exsiting option