+ Add a new configuration to enable alternative names for RAILS_ENV.

  This allow us to use vlad:migrate for other web frameworks using alternative
  environment variables (e.g., such as sinatra).

[git-p4: depot-paths = "//src/vlad/dev/": change = 8178]
prepped for release
[git-p4: depot-paths = "//src/vlad/dev/": change = 8192]
Patched up History.txt
[git-p4: depot-paths = "//src/vlad/dev/": change = 8248]
- Apparently psych doesn't have top level #y. Switched to to_yaml. (erotte)
[git-p4: depot-paths = "//src/vlad/dev/": change = 8263]
prepped for release
[git-p4: depot-paths = "//src/vlad/dev/": change = 8282]
Fix for Issue #40
Set the :revision variable to "HEAD" as a default