Convert CDATA input to string before gsub'ing

Rails 3.2 API allowed arbitrary input for cdata_section;
this change re-introduces the old behaviour.
Merge pull request #12693 from carpodaster/convert-cdata-input-to-string

Convert CDATA input to string before gsub'ing
add the fetch method to sessions
Merge pull request #12692 from dmathieu/session_fetch

Add session#fetch
short arrays in inspect
Merge pull request #12653 from releu/short_arrays_in_inspect

Short arrays in record.inspect
Update pull request instructions as per the new Github UI

[ci skip]
Merge pull request #12687 from notalex/master

Update pull request instructions as per the new Github UI [ci skip]