Add subdir-objects to configure.ac
Add tags to config file

This change modifies config file parsing to allow statsrelay addresses to be
"tagged". Tags make it possible for different addresses to occupy the same
portion of the hash ring, so that moving statsrelay shards or changing IP
addresses will not result in every key being rehashed.
Merge pull request #10 from sloppyfocus/master

Add tags to statsrelay config file