Don't use memcached_server_add_udp with libmemcached 1.x.

memcached_server_add_udp was deprecated in favor of using the
MEMCACHED_BEHAVIOR_USE_UDP behavior at the whole-pool level and unifying
the server_add functions.
Add myself to docs/coders.rst.
Merge pull request #139 from spladug/udp-connections

Don't use memcached_server_add_udp with libmemcached 1.x.
Remove Python 2.5 from Travis builds since it fails
Add compress_level to reference documentation
Update coders
Add release notes for 1.3.0 series
Move changelog into documentation
Update install instructions
Documentation updates

I wanted to mention we're in SMBC, too!
Merge remote-tracking branch 'origin/master' into py3k