Producing Bitcode

Hi all,

It's totally possible I'm missing something, but I'm having trouble getting PodToBuild deps to compile with bitcode.

I'm passing `--apple_bitcode=embedded --copt=-fembed-bitcode` into the build, so all the other parts of the project are building bitcode. But the linker informs me that the PodToBuild-based deps were "built without full bitcode," causing the linker to error. It's a matter of "-fembed-bitcode-marker" rather than "-fembed-bitcode", I'm assuming, based on the "full bitcode" part of the warning.

Is building with bitcode indeed not work currently, or am I missing something? And if it is indeed missing, any chance I could ask you to consider adding it?

Thanks so much,
Chris

Edit: I should have noted:
The example I first ran into is GoogleToolboxForMac--which doesn't seem to do any bitcode disabling in their [podspec](https://github.com/google/google-toolbox-for-mac/blob/master/GoogleToolboxForMac.podspec).
This is with the latest release of PodToBuild.