Disable the IPv4 travis job
Merge pull request #343 from g-oikonomou/travis-disable-ipv4

Disable the IPv4 travis job
Removed unnecessary code from resolver.
Merge pull request #345 from oliverschmidt/master

Removed unnecessary code from resolver.
Initialize tcpip process before resolver process.

Since introduction of mDNS (https://github.com/contiki-os/contiki/commit/f145c17039b778cde1d53b6828757cd91dc8480a)
the resolver process initialization depends on the tcpip process
already being initialized (because of the call to udp_new()).
Merge pull request #346 from oliverschmidt/master

Initialize tcpip process before resolver process.
Removed unnecessary code from resolver.
Merge pull request #351 from oliverschmidt/master

Removed unnecessary code from resolver.
Merge remote-tracking branch 'upstream/master'