Document the session plug and move it to new config
Document the parsers plug and move it to new config
Document the static plug and move it to new config

We have also cleaned up and move Phoenix.Project
to Mix.Phoenix so nobody relies on such logic outside
of Mix tasks or Mix specific behaviour (like the code
reloader).
Document the method override plug and move it to new config
Move code reloader configuration to Phoenix environment
Update CHANGELOG
Merge pull request #389 from phoenixframework/jv-config

Clean up compile-time router configuration