Issue 14: we forgot intents

We resolved issue 14 on today's call, but right after the call ended I 
realized that we did not define an extension for specifying intends in 
the BPEL process. In a previous call we had informally agreed that 
specifying intends in the process made sense. Issue 14 is not just about 
services and references but about everything that can be specified in 
the process.

-Anish
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