Test memcached on Travis.
Only build libmemcached for deploys.
`go.net` has moved.

Ref. https://golang.org/s/go14subrepo. Update envconf and go-etcd.
Merge pull request #126 from mozilla-services/feature/travis-memcached

Run memcached tests on Travis
Makefile: Ensure `GOLDFLAGS` is set correctly.
Merging #128.
Protect against nil pointer exceptions for pings.
Merge pull request #129 from mozilla-services/bug/nil-origin

Hotfix: Protect against nil pointer exceptions for pings
Raise log levels for locator errors.

Squelch `io.EOF` errors for closed sockets.
`UpdateHandler`: Avoid hangs for bad primary keys.
Worker: Clean up message parsing.

* Simplify `isPingBody`. Use `json.Compact` instead of tokenizing the
  byte slice.
* Fix an issue that treated arbitrary one-byte slices as pings.
Merge pull request #130 from mozilla-services/feature/level-up-logging

Raise log levels for locator errors
Add missing sample config options. Closes #104.
Add `AvailableExtensions.{Get, SetDefault}()`.
Add tests for malformed endpoint keys.
Merge pull request #131 from mozilla-services/feature/parse-cleanup

Clean up message parsing
Add logging.name setting.
use log.name-Version as heka LogName

Make the Heka Log Name a configuration param. Allows for clear
product separation in kibana
Merge pull request #136 from jrconlin/feature/logname

use log.name-Version as heka LogName
Add /realstatus/ to clientMux