remove webinar link from readme

README.rdoc

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 fog is the Ruby cloud computing library.
 
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-Thursday, October 14, 2010 10:00 am PST, hear it straight from {geemus}[http://github.com/geemus] in the {fog webinar}[http://pages.engineyard.com/FogWebinar.html]
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 The quick and dirty, top to bottom:
 * Collections provide a simplified interface, making clouds easier to work with and switch between.
 * Requests allow power users to get the most out of the features of each individual cloud.