Use hobby-dev as default db
Merge pull request #179 from catsby/default_postgres_plan

Use hobby-dev as default db
[fix #171] Refactor Rake Detect and Run

Move rake task detection and running to a separate independently tested class.

Compile exits when rake tasks cannot be successfully detected with error message
Merge pull request #172 from heroku/schneems/better-rake-detect

[fix #171] Refactor Rake Detect and Run
[ci skip] Changelog
Generate jekyll site
Fail build if jekyll site generation fails
output error info for debugging
Write a README for *this* buildpack
Minor README edits.
Pipe errors from jeyll compilation
Patch from @aJanuary. Override jekyll server and autorebuilding in _config.yml
Update build output in README
More README updates.
Upgraded jekyll command to jekyll v1.2.1
Updated README.md