add function to return issue status

fix #24 (closed)

add a function returning issue status through the graphql api

this is made more complicated by gitlab graphql lib not supporting a non-array-at-root graphql reply?! (it crashes if there is no nodes field in the response root.) I copied part of the code from their adaptor and massaged it until it worked for this particular usage, but i don't know for a fact that it would work for any graphql query possible