feat($compile): change directive's restrict setting to default to EA (element/attribute)

Previously we defaulted just to A because of IE8 which had a hard time with applying css styles to HTMLUnknownElements.

This is no longer the case with IE9, so we should make restrict default to EA. Doing so will make it easier to create
components and avoid matching errors when creating new directives

BREAKING CHANGE: directives now match elements by default unless specific restriction rules are set via `restrict` property.

This means that if a directive 'myFoo' previously didn't specify matching restrictrion, it will now match both the attribute
and element form.

Before:

 <div my-foo></div> <---- my-foo attribute matched the directive
 <my-foo></my-foo>  <---- no match

After:

 <div my-foo></div> <---- my-foo attribute matched the directive
 <my-foo></my-foo>  <---- my-foo element matched the directive

It is not expected that this will be a problem in practice because of widespread use of prefixes that make "<my-foo>" like
elements unlikely.

Closes #8321