Support filepaths with `dots`. about proto-lens HOT 2 OPEN

Thank you for the report. I have mixed feelings about such a change, as well as the discoverability of such a feature. If the user doesn't put the right module name ahead of time in exposed-modules, then proto-lens won't generate code for that .proto file, and the user will need to know ahead of time to use the magic "Dot" replacement in the module name.

At the least, though, we should change the proto generation code to detect if any of the proto files have a . in their path and give a better error message.

In your project, would it have worked to pass the full path to .protodir as the root dir (for example: main = defaultMainGeneratingProtos ".protodir") so that .protodir/myfilename.proto would just become Proto.Myfilename? If so, that would be my preference for the level that we support. But if not, let us know and we can consider another approach.

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Another possibility would be to allow overriding the generated module name, similar to: https://github.com/google/protobuf/blob/master/src/google/protobuf/descriptor.proto#L324
which might solve a more general class of such problems. Though that would probably require implementing #27 to be able to use Haskell-specific custom options, similar to ScalaPbOptions

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