make travis dependency resolver quiet
removes other credentials from .travis.yml
moves scm in pom.xml to github.com/tracee/tracee
fixes travix repo_slug in .travis.yml
Move all I/O related packages to binding folder
Merge pull request #55 from SvenBunge/binderGroup

Move all I/O related packages to binding folder
fix coveralls badge url
Group all backends within one submodule
Merge pull request #54 from SvenBunge/backendGroup

Group all backends within one submodule