Django-herokuapp

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- Better detection and fallback for scripts that require the Heroku toolbelt, but cannot locate it.
- Default deploy script is aware of popular CI build systems, and only builds on the master branch by default.
- Information about forcing SSL on an app.
- Improving heroku_audit command with detection for more potential problems.
- Allowing email providers other than SendGrid to be used without breaking heroku_audit.

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- Correctly interpreting Django BASE_DIR setting.

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- Adding in Heroku-compatible logging configuration to project template settings.
- Updated project template to match Django 1.6 default settings.
- Added heroku_audit command.
- Removing herokuapp subcommand. Loading the config in manage.py is preferred.

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- Adding an --app parameter to the herokuapp and heroku_deploy management commands.
- Updating Django version for new security release.
- Package updates for all base requirements.
- Changing default HTTP server to waitress.
- Adding default settings for HTTPS proxy headers and allowed hosts.

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- Fixing hash generation for gzipped content.

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- Updating packages, notably django-storages.
- Removing hacked S3 storage, now that django-storages has fixed gzipping.