Update README.md
Merge pull request #5 from neamtua/master

Multiple OS support and enhancements.
Arranged the code.
Converted CSS to Sass. Closed issue #3
Updated Readme
Changed index from php to html
Added a favicon.
Change background size to cover
Minor UI tweaks
Added server time
Merged js functions. Buggy server online since feature.
Some improvements to server online since feature
Fixed server is online since
Minor changes
Styled current and active since sections
Updated since time and Readme screenshot
Cleaned up the code returning the date the server was turned on, added a more reliable way of measuring it instead of strtotime. Minor modifications in the javascript order of requests.