Directives class name selectors

[Kindzoku]

Here is another 50 cents from me. :)
Angular Directive

Declare as one of the following:

element-name: Select by element name.
.class: Select by class name.
[attribute]: Select by attribute name.

I edited directive declaration, so it'll try to parse different types of selectors a bit stricter.
So in case of element-name we'll restrict directive to E, in case of .class - to C, and in case of [attribute] - to A.

And I just wanted to add that your library is truly awesome!

[coveralls]

Coverage increased (+0.8%) to 69.868% when pulling 1789ed8 on Kindzoku:Directive_fix into 9382664 on vsternbach:master.