Merge pull request #44 from moizjv/documentation

Adding v1.2.0 documentation with latest intro.md
disabled language selection
making rake work
Update appium.io
typo
Update appium.io
added rake install task
added dev_rebuild task
Update appium.io
dev_rebuild task fix
rake fix
Update appium.io
adding .travis.yml (squashed)
README update [ci skip]
Gemfile fix
Cleaning Rakefile, renaming rake tasks
better usage output
fixing broken github url, added tests
adding specs check in travis
Update appium.io