Imported functionality and tests from PHPMobiletDetect to Go
Edited README for basic descrpition
added example
fixed some issues with initiation, now possible to initiate with default rules. commented out negative lookahead regex regarding to issue #1
updated readme
added support for travis-ci
added go version 1, 1.1 to be tested with  travis-ci
travis-ci: fixed wrong go version
Update README.md
Update README.md
Add test to mobilegrade method
Add support for MobileGrade method