Safety measure on GoogleReader

Cf Skripach crash logs at http://www.cocoaforge.com/viewtopic.php?f=18&t=26573&sid=38253d1334b27782d22d2f31daa258a9#p138418
Safety measure for transactions ; improve refresh indicator

After seeing http://www.cocoaforge.com/viewtopic.php?f=18&t=26578
Serialize uses of the jsonDecoder

As recommended by JSONKit documentation
Use the jsonDecoder itself for serialization
Fix crash

As described at http://forums.cocoaforge.com/viewtopic.php?t=26583&p=138447
Fix crash 2

Crash caused by simultaneous attempts to update count of unread articles
http://forums.cocoaforge.com/viewtopic.php?f=18&t=26573
Crash prevention

Should two processes attempt to simultaneously update unread count
Merge pull request #294 from dcotton14/master

Decode URLs for enclosures (handle enclosures with spaces in name)
Merge pull request #295 from barijaona/bugfixes

Prevent some crashes
Remove a Xcode warning on dynamic library
setFlipped is deprecated
Just use the default NSFileManager
Replace InternetConfig use with LaunchServices

Once upon a time, there was http://www.macorchard.com/classic/other/InternetConfig.php ;-)
I hardly believe that it is still present in Mac OS X, even if it is completely undocumented !
Add Hootsuite plugin

Provided by Cocoaforge user vineviz
We just need Growl 2, as PowerPC has been deprecated
Codesigned the frameworks with my Developer ID key
Change code signing (OSX 10.9.5 and + conformity)

Resource Rules are deprecated, and each framework must be code signed individually.
Fix cell size problem when user edits folder name
Merge pull request #296 from barijaona/bugfixes

Remove some Xcode warnings, optimization and code signing change
Must resign all frameworks with same Developer ID