Move the default route to the bottom, as this practise should be discouraged.
Add documentation for resources, external redirects and Rack applications.

Worse still, its use breaks some rdoc, replacing method names with a curly brace.
Having just one call-seq directive doesn't add anything since this is covered by regular rdoc.
Having multiple might make sense, but these are already documented with examples.

This partly re-reverts 60de0e56 but does not
touch the vendorized code in html-scanner.

Revert "call-seq directive makes rdoc cry and replaces method names with a curly brace; besides it doesn't add anything when you only list one call example since this is obviously documented already"

Reason: Part of this commit touches vendorized stuff, the rest is fine, could you please repatch?

This reverts commit 60de0e56.

call-seq directive makes rdoc cry and replaces method names with a curly brace; besides it doesn't add anything when you only list one call example since this is obviously documented already

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

Make InstanceTagMethods#value_before_type_cast raise if the model don't respond to attr_before_type_cast or attr method

[#3374] [#5471 state:committed]

[#5469 state:committed]
Signed-off-by: NSantiago Pastorino <santiago@wyeworks.com>

getting started guide: adds a reference to Michael Hartl's free online book in the what's next section

Add clear_helpers as a way to clean up all helpers added to this controller, maintaing just the helper with the same name as the controller.