Add missing license headers

And removed the "Author" tag in there since there are multiple
authors for each file.. Use the git log to see who wrote stuff
instead of trusting a tag no one updates ;-)

Change-Id: I6a2829b92ecd92c08226308825c63703960e7219
Reviewed-on: http://review.couchbase.org/27374
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>