Replaced properties by ivars;
Changed #import to use SFBPopover's header file from the project rather than the framework. For now we'll leave the framework aside and only work with source.
Removed the framework target. Note that as of now the project is using ARC which means on 10.8 we can only build in 64bit. Building on 32bit will give the error "-fobjc-arc is not supported with fragile abi", but that will go away when we'll take out ARC.