Improve channel docs, close #380
Initial work on router pipelines
Add support for multiple router pipelines
Rename stack to pipeline and add plug :action
Merge pull request #384 from phoenixframework/jv-pipeline

Implementation of multiple router pipelines
Start router and test request/response
Add initial WS/Channel integration tests
Bump docs
Add HTTPClient and rename WS client
Add HTTPClient and rename WS client
Document request options
Provide Socket.assign/get_assign ex. Closes #381
Merge pull request #391 from phoenixframework/cm-integration-tests

Start router and test request/response
Update Router helpers documentation in README
Merge pull request #393 from stevedomin/steve-update-readme-router

Update Router helpers documentation in README
Code block for route helpers is terminated too early
Merge pull request #395 from stevedomin/steve-update-readme-router

Code block for route helpers is terminated too early