Fix markdown formatting

[ci skip]
Remove stray input

[ci skip]
Added extra readonly test for history

See #453
Guide rails4 users to rc2 version instead of beta
Merge pull request #460 from vollnhals/patch-1

Guide rails4 users to rc2 version instead of beta4
Improve support for non-integer primary keys

Only skip the regular AR default find if the primary key is an integer
AND the given ID is also an integer (need to support UUID primary keys)

Resolves #461
Resolves #455

Signed-off-by: Norman Clarke <norman@njclarke.com>
Memoize primary key type.

Adds test to ensure a string primary key is handled properly

Signed-off-by: Norman Clarke <norman@njclarke.com>
Updated changelog
Fix reversion to previous slug with history module

Specifically, when users are using the recommended overridden definition
of should_generate_new_friendly_id? to get new slugs on column changes,
the slug generator would consider historic names to be conflicts. This
fixes reversion specifically for that case.

Resolves #463
Correctly sequence numeric slugs

Resolves #454
Updated release date in changelog