Squashed 'src/dmclock/' changes from 1bbd42b8fe..d1ff03b667

Squashed 'src/dmclock/' changes from 1bbd42b8fe..d1ff03b667

d1ff03b667 Merge pull request #44 from adamemerson/wip-system-includes
4cc4b949ca build: Mark dependency includes as SYSTEM in dmclock
05096c1756 Merge pull request #43 from TaewoongKim/anticipation_conf
f356c45461 Add missing anticipation_timeout argument for PullPriorityQueue constructor
9896448ec5 Merge pull request #42 from tchaikov/wip-cmake
979899ef86 add travis CI on gnu/linux
8a3dabdbee cmake: the built archives are located in ${binary_dir}
ee15ced3e9 cmake: check for include in /usr/include also

git-subtree-dir: src/dmclock
git-subtree-split: d1ff03b667d9551478b2803ea533fc356ca441a9