Move unshared code out of Util.
Merge pull request #738 from square/jwilson_0420_kill_utility_code

Move unshared code out of Util.
Update NPN dependency to target jdk7u60-b13 and Oracle jdk7u55-b13.
Merge pull request #742 from square/adrian.bump-npn

Update NPN dependency to target jdk7u60-b13 and Oracle jdk7u55-b13.
Clarified behavior of AsyncApi when a request is cancelled.