Add CONTRIBUTING.md (closes #221)
Merge pull request #477 from citizen428/add-contributing.md

Add CONTRIBUTING.md
Add parameter filtering for logging
remove unused variable
consider camelcase parameters set in `config.filter_parameters`
Log pipeline in controller logger
Store pipelines in conn
Revert super for overriding pipeline and add note
Typo fixes in Channel.Transport
Merge pull request #480 from gjaldon/log-pipeline

Log pipeline
Merge pull request #481 from gjaldon/fix-typos

Typo fixes in Channel.Transport
Resolve conflicts
Merge branch 'ma2gedev-parameter_filter'
Add 0.6.1-dev with param filter note
Fix start docs. Closes #479
Update Phoenix to Plug 0.8.3 with new error handling
Add debug error handling to Phoenix
Improve integration tests
Improve coverage for code reloader
Add new error rendering layer