Server-based parsing for continuous updates

[jefffohl]

@breznak I am making a pull request for this solution to the continuous updates issue. Adding this functionality required a dramatic rewrite, which includes:

• Building a server for the reading of local (and in the future, remote) files.
• Implemented socket.io as the primary method for exchanging data between the server and the client. This allows us to push data from the server to the client as new data comes in.

In this branch I also modified some things. Specifically:

• The function used to highlight thresholds in the graph. It is now more accurate.
• The notification system is improved.
• The layout has been improved.

Please let me know your thoughts. I would appreciate your feedback before I merge, since there are such extensive changes.

[breznak]

@jefffohl I'm going to test and merge this brange, as it's a lot of work.
I'd like to revive the project, eg. by using it in breznak/openDS-oss#28 and spreading more its usage.