Allow pass-through attributes for other use cases.  Maintain same defaults as prior version.
Actually, now that I look at it more closely, attributes on the declaration are carried over onto the directive's template.  That simplifies some things.  Now, explicitly set class and data-clientid and simply default the other attributes that existed in previous versions.  This should allow for explicit setting of supported attributes without requiring the directive to get involved.
Minor cleanup of comments and variable names.
* Change component name to make bower happy
* Rev component version
Realized I was confusing <attr> and data-<attr>.  When just using element attributes, G+ API docs states that you use data-<attr>.
Merge pull request #5 from dbitting/master

Better manage pass-through attributes