minor fixes for sharekit#328

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eric-sofisoftwarellc wants to merge 3 commits intoideashower:masterfrom

eric-sofisoftwarellc:master

Commits on Dec 13, 2011

Remove extra #define SHKSharedWithSignature
eric-sofisoftwarellc
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In validate, check for length > 0, not length >= 0, to avoid trying to send an empty Twitter status
eric-sofisoftwarellc
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Add empty evernote #defines
eric-sofisoftwarellc
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