[#62860768] Adds a page to the knowledge base discussing supported browsers. Also adds a new "general knowledge" section under "basic user knowledge".

General Section index:
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![fullscreen_1_22_14__11_34_am](https://f.cloud.github.com/assets/2251119/1976495/7d6e960c-838b-11e3-8084-058670eeab94.jpg)


Supported Browsers Page:
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![fullscreen_1_22_14__11_35_am](https://f.cloud.github.com/assets/2251119/1976498/8cd43840-838b-11e3-9724-260febe94350.jpg)