added compiler flags for

- warnings on unused imports
- warnings on numeric widening
- disabling adapted args (automatic tuple conversion)
- fail the build on compiler warnings

Overall this should lead to increased code quality.
Merge pull request #778 from mesosphere/wip-compiler-flags-drexin

added compiler flags for
updated scala version to 2.11.4
Merge pull request #776 from mesosphere/wip-scala-2.11.4-drexin

updated scala version to 2.11.4
Handle containers without port mappings.

- Fixes #779.
Merge pull request #781 from mesosphere/779-container-dropped-no-mappings

Handle containers without port mappings.
Minor scaladoc fixes.
Merge pull request #782 from mesosphere/scaladoc-fixes

Scaladoc fixes
Setting version to 0.7.5
Setting version to 0.7.6-SNAPSHOT
Update docs for release 0.7.5
Merge pull request #783 from mesosphere/docs-update-0.7.5

Update docs for release 0.7.5
no message
Merge pull request #784 from bolcom/used-by-bolcom

Add bol.com to list of companies using Marathon
Update README.md