Optimize _clearCache().
It is cheaper to make an assignment or call strtolower() than to pluralize.
Merge pull request #2186 from bar/clearcache

Optimize _clearCache().
Revised CakePHP and external links on the home page
Some DocBlock improvements for Model.php
Merge pull request #2188 from ravage84/model-docblocks

Some DocBlock improvements for Model.php
Merge pull request #2189 from jameswatts/feature/home-links

Revised CakePHP and external links on the home page
Updated links to CakePHP resources
Merge pull request #2191 from jameswatts/feature/skel-links

Updated links to CakePHP resources
Added link to CakePHP roadmaps to support contributions
Added link to CakePHP roadmaps to support contributions
Optimize conditionals and reduce lookups.
Also, make the code easier to read removing unneded indentations.
Improved wording of link to GH repo in home.ctp
Fixed docblock. Closes #2193
Merge pull request #2194 from ravage84/gh-link-home.ctp

Improved wording of link to GH repo in home.ctp
Emptied home.ctp in test_app as much as possible

This file is never seen by anyone but gets analyzed by
``ExtractTaskTest::testExecute()``
Merge pull request #2196 from ravage84/orphaned-home

Emptied home.ctp in test_app as much as possible
Merge pull request #2187 from bar/model-optimizations

Optimize conditionals and reduce lookups.
coding standards
Update definition of an empty model.
Update tests for incorrect containable behaviour if a model only finds 1 field.