Wake multiple PCs & SleepOnLan change

Add functionality to wake multiple PCs with simple dropdown
Add option to change the sleep method issued to the SleepOnLan software
Changed submit button (wake, sleep) name so didnt interfere with
javascript on dropdown
Bug fixes and IE compatability

Fixed bug with change in submit button name not being replicated through
code
Added some handling for IE form submission when pressing return (hidden
submit fields)
Integrated Multi-PC Support

Integrated changes from ahodgey\'s pull request.
Computers now identified in URL by GET Variables instead of by hidden POST variables.
Corner cases tested and fixed.
Added more navigational links.