It's still early work in progress and I've only tested with a few apps so far. Also test coverage could certainly be better. If you find any issues, feel free to ping me up (@vpdn).
Thanks! I think I screwed up the source_files regex in the Podfile. Have pushed a new pull request to the Cocoapods repo, hopefully will be fixed soon.
Update: There's a transitioning period currently ongoing at Cocoapods (migration to Cocoapods Trunk). For now please use the updated podspec in the github repo directly:
The Podspec seems a little screwy, it's not installing the actually library files, just the PSDWriter classes.
Edit: I notice the pod spec has changed since the tag - maybe you need to tag a new 0.1.1 ?
Edit 2: Using "pod 'MMLayershots' :head" in the pod spec still doesn't work.