Improve signed cookies documentation

Fix typo in submit_tag helper documentation

Raise a rescuable exception, rather than responding with a head :not_acceptable (406)

Raise a rescuable exception when Rails doesn't know what to do with the format, rather than responding with a head :not_acceptable (406)

Use `take` instead of `first` to avoid unwanted implicit ordering. Closes #6147.

Use strict mode in mysql

Prevent creating valid time-like objects from blank string from db

Revert "Merge pull request #5494 from armstrjare/active_record_relation_keep_association_join_context_on_merge"

This reverts commit dcd04e76, reversing
changes made to 58a49875.

Issue #6045

Merge pull request #5494 from armstrjare/active_record_relation_keep_association_join_context_on_merge

ActiveRecord::Relation - maintain context of joined associations on merges

As mentioned in http://redcloth.org/textile/writing-paragraph-text/#dashes
RedCloth converts double hyphens to emdashes. This causes problems in
the guides where options like --database, --full are rendered incorrectly.

This commit fixes it by customizing the emdash method in the
RedCloth::Formatters::HTML module to just return '--'. See their FAQ
http://redcloth.org/faq in the section 'How do I customize RedCloth?'

check checkboxes with array of strings as :checked option

Update `first`, `last` and `take` in guides

SessionStore was recently changed to delegate to hash
object instead of inherit from it. Since we don't want
to extend SessionStore with every method implemented in
Hash, it's better to just convert any object passed to
debug_hash (which is also better as we don't require
to pass Hash instance there, it can be any object that
can be converted to Hash).

Respond to missing

Modify test schema.rb to use a VARCHAR rather than a TEXT when a default is required to keep MySQL happy.

closes #4894

postgresql adapter should quote not a number and infinity correctly for float columns

Beginning and end of hour support for Time and DateTime

Use Hash#fetch instead of has_key? check

Enable misnamed time_with_timezone_tests in activesupport core_ext