Implement a DockerRunner module.
Implement a DockerRunner module.

Implement a docker based compilation runner module, with support for
timeouts and with added isolation and security compared to the
default CommandRunner module

Signed-off-by: Xavier Trochu <6e31b7ccf43b2544cf440401f1df8a297d62b254@edpsciences.org>

EDP-Sciences/clsi-sharelatex