Missing any documentation on how to configure steps and omnifunc

[glemco]

First of all thanks for the great plugin, I totally underrated it because it was not doing any auto-completion, just until I found out it does! Is there any reason why in the readme you don't mention to set b:cucumber_steps_glob and that you can use the omnifunc out of the box? It's fairly trivial to find it in the source code but I think it should be written somewhere. Let me know if I missed it and it is there already. Otherwise I could even open a PR myself