fix headers syntax in Dancer::Response perldoc

Dancer::Response expects lists and arrayrefs in its external interface
(constructor and headers() methods), not HTTP::Headers objects.
document fix in CHANGES file
Merge branch 'pr/response-perldoc-fix' into devel
Call after hook even when before hook redirects

A redirect in a before hook shortcuts executing the route, but
an after hook should still have an opportunity to see the request
just as if the redirect had happened in a route handler.
Add 'on_reset_state' hook

This hook allows plugins to reset global state at the same time
as Dancer does.
Merge pull request #921 from PerlDancer/topic/improve-session-cookie-support

Improve session cookie support (and fast session support)
fix bad L<> in pod

Fixes #920
bump version
add example for request parameters
implement lazy session flushing
changelog
Merge branch 'pr/923' into devel

Fixes #923

Conflicts:
	CHANGES
Merge pull request #922 from szabgab/feature/doc

add example for request parameters
changelog
add new contributors, fix version
make pod.t a release test
forgotten change entry
exit with code 255 upon error
bug report
dancer dies with 255 error code upon invalid application name

Fixes #919