[elbenwald] no own Gemfile anymore
[elbenwald][all] .travis.yml no top-level
[elbenwald] fixed doc
[elbenwald] no project specific rspec settings
[elbenwald] no files to ignore anymore
[all] build status in README.md
[all] modified spec structure for Travis
[all] fixed .travis.yml
[all] Rspec 3 is being needed to run all tests successfully
[all][spec] no more rspec deprication warnings