Stacker

- stacker subcommands [GH-35]
- Added Empire production stacks [GH-43]
- Major change in internal code layout & added testing
- added destroy subcommand [GH-59]
- Local Blueprint Parameters [GH-61]
- Lockable stacks [GH-62]
- Deal with Cloudformation API throttling [GH-64]
- Clarify Remind's usage of stacker in README [GH-70]

- Stack Specific Parameters [GH-32]
- Random fixes & cleanup [GH-34]
- Handle skipped rollbacks [GH-36]
- Internal zone detection [GH-39]
- Internal hostname conditional [GH-40]
- Empire production stacks [GH-43]

- Optional internal DNS Zone on vpc blueprint [GH-29]
- Add environment concept [GH-27]
- Optional internal zone cname for rds databases [GH-30]

- remove auto-subnet splitting in vpc stack (GH-25)
- create bucket in correct region (GH-17, GH-23)
- asg sets optionally sets up ELB w/ (optional) SSL
- Remove DNS core requirement, add plugin/hook system (GH-26)

- Allow AWS to generate the DBInstanceIdentifier

- Bah, typo in version string, fixing