Fix incorrect placeholder handling for nested model field

Closes #411
Fix column ambiguous error in OrderedBehavior

Closes #418
Update signature to avoid E_STRICT errors

See: cakephp/cakephp#1622
Increase minimum cakephp version in the Install page
Sort results to avoid ordering error in Postgres
Another round of E_STRICT fixes

See: cakephp/cakephp#1623
Merge branch 'master' into 1.6

Conflicts:
	Croogo/Test/Case/View/Helper/CroogoFormHelperTest.php