I have added a section to the wiki:
https://wiki.unrealengine.com/Speech_Recognition_Plugin#Sphinx-UE4
Please take a look. 
and let me know of any problems.
I have created an experimental branch in Github. (this is what is used by the above demo)
For now, the major changes are correcting the enum spelling + more granular tolerance settings.
However, in the future, I plan to change this up considerably, and merge back when it is significantly improved in all respects.
Tomorrow, I plan to create some C++ examples, that will show-case the plugin as well.