Headers are marked as private - causes issues when integrating the SDK as sources

[blach]

The files BITHockeyLoggerPrivate.h and BITChannelPrivate.h are marked as private in the Xcode project.

When archiving my app, these header files are put into the "Private Headers Folder Path" which by default is /usr/local/include.

The headers should be marked as "Project", not "Private". "Private" headers are exported to the build product.

Here is how that looks in my app archive:

Xcode doesn't recognize the archive as an iOS app, so I cannot upload it to the App Store.

If I change the header to "Project", everything works as expected.

[lumaxis]

Thanks for catching this!