Add tempqueueprefix option.

This adds a new option for the client

tempqueueprefix  = /queue by default.

The motivation for this is that it allows you to set 

tempqueueprefix = /temp-queue 

for use inside the activemq connector.

This allows you to benefit from 

http://activemq.apache.org/apollo/documentation/user-manual.html#Temporary_Destinations

by default the value /queue so all is backwards compatible.

After adding this configuration the temporary queues automatically vanish when the client 
closes.