Add doc blocks.
Fix coding standards issue.
Remove unused fixtures.

Kill off a pile of fixtures we are no longer using.

Refs #2345
Remove AclShellTest case.

The AclShell has been deleted for a while, remove the test case (which
was skipped) as well.
Merge pull request #2642 from cakephp/3.0-remove-fixtures

3.0 remove fixtures
Make error message for missing fixture easier to understand.

Telling both the class, fixture reference and test case will help
people solve problems a bit quicker.
Extract a protected method.

If anyone wants to subclass this, having a separate method will be nice.
Improving TupleComparison
Improving a bit more TupleComparison expression
Adding support fro traversing TupleComparison expressions
Make it easy to put inputs *inside* label elements.

This is a frequently requested feature that is much easier to implement
now. Add it so it is easy to integrate bootstrap & older versions of
foundation.
Merge pull request #2640 from markstory/3.0-radio-widget

3.0 - Create radio widget
Update test app to match new app folder structure.
Updated base url parsing to account for app's folder structure changes.
Adding support for a single ExpressionInterface as the value for
a TupleComparison
Improving docs for the TupleComparison expression class
Fixed argument use in TupleComparison
Start implementing checkbox widget.

Basic features and attributes are working, next up is making
checked property smarter.
Expand logic to detect checked.

Since value is a primitive attribute, re-using it for checked/selected
state is a bit of a bad idea. This will probably lead to refactoring in
selectbox and radio as well.
Convert value to selected in SelectBox.

Having consistency between checkbox, select, and radio is more important
than keeping the code stable at this point.