Checking browser version

The code checks whether the user's browser to the list of supported. Are listed on the page: https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/install/requirements.md#supported-webbrowsers. If the browser is outdated or unsupported - displays information block.

![](http://puu.sh/b76q6/8f3c6966d7.png)

All rules are described in config file: [config/initializers/browser_modern_rules.rb](https://github.com/zzet/gitlabhq/blob/c986154cffecdccd2c6dfd659dcba1585249ab37/config/initializers/browser_modern_rules.rb)