Proper AsyncHttpClient runtime handling in SerializedSocket. (backport
from master)
 Don't complain about the runtime not being closed even though it
actually is :). (backport from master)
 Allow for safe coarser-scope shared AsyncHttpClient creation for which
no client and its options builder exists. (backport from master)
Merge pull request #111 from thabach/wasync-1.x

Wasync 1.x , Backport from Master of recent Pulls.