Pull out some re-used subpatterns.

Having smaller segments makes reading the larger patterns simpler, and
allows for less duplication across the various patterns.

Refs #2436
Relax the 'my' and 'ym' date validation formats.

All other formats that include 'y' allow 2006 or 06. These formats are
now conformant with the other formats available.

Closes #2436
Fix mixed tabs/spaces.
Make API docs easier to read.
Don't always wipe a Model's _schema property when calling setSource()

Only wipe the internal schema cache if listSources() returned a useful
list of sources. Otherwise retain the old schema. This lets datasources
that don't implement listSources to be combined with models that define
static schema properties.

Fixes #2467
Add Configure timezone to boostrap
Fix whitespace error.
Fix whitespace error in Validation utility
Remove smart quotes from Configure timezone in bootstrap
Clean up grammar in Configure timezone in bootstrap
Merge pull request #2494 from bcrowe/hotfix-configTimezone

Add Configure timezone to bootstrap
Fix input type inference when type=>checkbox

FormHelper should not infer types when the explicit type is checkbox.
Instead the provided type should be used.

Fixes #2491
By default use filter_var() to valid email addresses in CakeEmail.

Refs #2477
Merge pull request #2499 from ADmad/2.5-cakeemail

By default use filter_var() to valid email addresses in CakeEmail.
add DispatcherFilter Settings
Fix Postgres for bigint primary key.
Correct doc block
Merge pull request #2502 from okinaka/fix-postgres-for-bigint-primary-key

Fix Postgres for bigint primary key.
Merge pull request #2503 from dereuromark/master-string

Correct doc block
undo remove end line break