added rule and test
added rule and test
added tests
Merge pull request #210 from mimmi20/issue-208

Fixes #208
Merge pull request #211 from mimmi20/issue-206

Fixes #206
Merge pull request #212 from mimmi20/issue-209

Fixes #209
Merge branch 'master' of https://github.com/browscap/browscap into extract-engines-devices