Switched some NSAutoreleasePool calls to @autoreleasepool as per https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSAutoreleasePool_Class/Reference/Reference.html#//apple_ref/doc/uid/20000051-1722
Merge pull request #333 from josh64x2/autoreleasepool-improv

Switched some NSAutoreleasePool calls to @autoreleasepool
Adapt the browser tabs to OS X Yosemite

Setting to YES the sizeCellsToFit property made the ‘Articles’ pane to shrink to be invisible where many panes were loaded.
Merge pull request #336 from barijaona/issue330bis

Adapt the browser tabs to OS X Yosemite
Fix display of unread count on Yosemite (issue #332)
Merge pull request #337 from barijaona/issue332

Fix display of unread count on Yosemite (issue #332)
tested OK on Snow Leopard 32bit and Yosemite GM