Fix memcache in doctrine, fix textarea field#25

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WhiteOwlUk wants to merge 2 commits intosymfony:masterfrom

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Commits on Oct 9, 2010

Fix bug in Doctrine extension class. Now Memcache work correct. Before call to a member function get on a none object. Because $cacheDriver is a string
WhiteOwlUk
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Change method to data because $field has no method getDisplayedData
WhiteOwlUk
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