* adding atlantis bootstrap mode to support getting started with atlantis for first time users
* removed unwanted confirm variable
* vendoring dependencies
* more vendoring
* more more and more vendoring
* comment about bootstrap package
* Proposed changes (#84)
* reviewed all the comments
* removing required approval flag since we will default to false
* 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
