Revert "switch default heroku strategy to git"

This reverts commit d4fff2fb66aedb93b9d4dadf0281623de937ce06.
bump version
load json for s3
bump version
Adds mime types when uploading files to S3

- Adds mime-types gem file dependency
- Sets the mime type of each file when uploading to S3
Updating s3 to add mime types, fixing variable typo
Spec for setting MIME type for files uploaded to S3
Merge pull request #87 from dpowell/master

Set MIME type for files uploaded to S3
Added Modulus support.

Includes Modulus provider class to deploy a project using the Modulus
command line interface as well as updates to the usage documentation.
Updated to use the option function.

This will force an error to occur if either of the (required)
parameters are omitted from the command.
Added rspec test.

Updated the validate the api key and project name parameters as well.
Merge pull request #88 from fiveisprime/modulus

Added Modulus support.
Re-add 'af' gem to Gemfile for now
Fix dependency issue (at last!)

I've specified the version for several gems in the Gemfile, which stops
Bundler from hanging infinitely on 'Resolving Dependencies'
Added Coveralls.io integration