Add mention of teclacolorida blog post

StemboltHQ · Jul 18, 2013 · e36b3eb · e36b3eb
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 This is a "re-do" of the official [spree_paypal_express](https://github.com/spree/spree_paypal_express) extension. The old extension is extremely hard to maintain and complex.
 
 Please attempt to use this extension *only in development* and report issues.
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+This blog post was a godsend: http://codecube.teclacolorida.com/2013/01/21/integration-of-paypal-express-checkout-using-active-merchant/.