Fix net.errClosing

We had a buggy pool logic. This commit simplifies the code and resolves
the issue of re-using closed connections.
Add package docs for connpool
Increase the timeout for server warnings
nit in bee
Merge branch 'master' of github.com:soheilhy/beehive
Fixes conn.Close
Nits in proxy logs
Increase default request timeout to 60 sec
Make go1.3+ client identical to the new stdlib
Nits in sync example
Copy data when collecting messages