Downgraded jackson-jaxrs dependency version

For better compatibility in jar-conflict szenarios I'd like to suggest to use jackson 2.1.2 as it seems that no 2.3.3 methods are in use yet.
Allow to pass HostConfig when creating a container

* Move HostConfig into separate class
* Use Links for container links instead of String
* Add API for passing HostConfig when creating a container
Fix parsing of Links and Link
Merge pull request #105 from vjuranek/hostconfig

Allow to pass HostConfig when creating a container
Merge pull request #102 from m451/patch-1

Downgraded jackson-jaxrs dependency version
Represent Linux capabilites as an enum

This avoids errors when entering capabilities due to different capabilty
names, e.g. "MKNOD" in docker vs. "CAP_MKNOD" in Linux manpages.
It also gives a natural home for documenting the meaning of the
individual values.
Allow to manage Linux capabilities in CreateContainerCmd

This was previously only availabale in StartContainerCmd.
The introduction of HostConfig as a parameter to /containers/create in
Docker API v1.15 allows to specify capabilites here as well.