* first incomplete draft for project config and pre run refactor
* adding prerun and terraform 0.9 and above support
* partial review
* Changes from pull review. Fix approvals
* more clean up and refactor of terraform init and environment commands to support terraform 0.9.0 and above
* making apply similar to plan for appending extra arguments
* review
* missed apply executor changes and fixing tests
* Adding the ability to get lock data and show it using the detail view in the ui for boltdb
* adding modal style
* Adding new modal based discard ui
* Adding detail view and get lock funtionality with unlocking with the UI
* lots of clean up after review
* using jquery most places now
* missed in merge
* this should cause a build failure
* moving e2e test as part of the test override step so they run if unit tests fail
* fixing boltdb tests
* turns out you can't fail fast in circleci
* don't compare locks
* Return locks when they're deleted
* Implement DeletePlan and DeletePlanByPull
* Clean up data from pull request on close
* Delete plan on successful apply
* added new flags `plan-backend`, `plan-s3-bucket`, `plan-s3-prefix` and deleted `s3-bucket`
* interface `plan.Backend` that is implemented by `file` and `s3`
* simplified s3 code
* didn't end up following my suggestions in #30 since storing stuff in metadata requires you to `Get` the object *first* and then use the metadata. By parsing the `Key` to get repo, pull, path, and env, it skips an initial `Get` step, and I can download directly to the correct directory
* allow users to specify `application/json` or `application/x-www-form-urlencoded` for the webhook delivery type
* remove sending of special header for pull request api (fixes#11)
Closes#30 and #17 and #11
