Bump version and add more info to config file

[akva2]

• This bumps version in dune.module to 2018.04-pre.
• Adds more info to the config file and adds a version file

Required due to upstream changes in opm build system, https://github.com/OPM/opm-common/pull/304

[akva2]

@joakim-hove please approve or tell me what to change so i can merge this with the rest.

[joakim-hove]

Sure - you merge when ready.