Update Readme with Mounting Multiple Versions

[przbadu]

improve documentation following (http://code.dblock.org/2013/07/19/evolving-apis-using-grape-api-versioning.html)

[przbadu]

@dblock: I just locked version of grape-entity to 0.5.0 and made a PR. Your suggestion for #1350. All test case are passing in update-readme branch now...waiting for travis ci to be successful

[dblock]

FYI I did that on master so we can have a build in #1353.

[przbadu]

Great, thank you, let me pull it and merge it

[przbadu]

@dblock : please check README and let me know for further improvements.

Thanks

[dblock]

It doesn't quite read as documentation, more like a blog post or example. Specifically, I'm not in love with curl examples and I definitely don't think we need to say what it took to make it happen (the grape fix). There should be a way to reduce the code, too, and also needs to be rubocop-ed.

It's a good start though. I can take a stab at this later or you can try iterating on it.

[dblock]

I think this belongs in Mounting more than Versioning, because Versioning is all about kinds of versioning schemes.

[dblock]

I appreciate the effort here, but I think it's a bit far from reading like a doc and wasn't active after my comments. I'll close it for now, please feel free to reopen with an update.