Adding some basic tests

[mshick]

Adding a few simple tests to do the following:

• Compile new .desc file from the .proto fixture
• Read that file
• Create a new protobuf instance
• Serialize / parse, and compare results

[mshick]

Oops. Missed the fact we need to recompile the protobuf bin for this test to be useful... I'll explore how to do that locally (within the project itself, I mean). Maybe all it takes is 'npm install' but I'll need to test to be sure.

[mshick]

I now see that npm install builds the binary, so the test seems valid.

I do see that Travis is failing -- I wonder if you have any idea how to declare system resources in this way, since the protoc command is assumed to exist, or if this sort of thing simply needs to be excluded from Travis?

[mshick]

Okay, added the protobuf-compiler to the Travis config. Hopefully it will pass now. :pray:

[fuwaneko]

Added proper test suite.