add cookbook entry on creating dynamic forms based on services#1842

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khepin wants to merge 7 commits intosymfony:masterfrom

khepin:dynamic_forms

Commits on Oct 30, 2012

merged all dynamic form articles in one. Added a section on advanced form configuration
khepin
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Commits on Nov 1, 2012

PHP5.3 syntax for arrays
khepin
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Commits on Feb 7, 2013

shorten dynamic forms article, don't explain what is already elsewhere in the book or cookbook
khepin
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