Change function names in Flash
Use simple kv storage for flash
Move Flash to Controller and plug :fetch_flash in browser pipeline
Use just 1 module in Channel Test
Only join has different error message for bad return
Merge pull request #558 from gjaldon/improve-channel-test

Improve channel test
Merge branch 'change-flash-api' of https://github.com/gjaldon/phoenix into gjaldon-change-flash-api
Add get_flash/2 to Phoenix.HTML
Bump changelog