Added separate createContext() function.
src: CLS is completely separated from domains now

Make sure that synchronous errors are accounted for, though.
1.1.1
src: continuation-local-storage-glue no longer necessary

Instead this module now depends on async-listener, a polyfill
intended to replicate the addAsyncListener API Trevor Norris is
presently experimenting with adding to Node core. As it's a pure
polyfill, CLS can just load it if necessary and include all of
the CLS functionality directly in the module.
Removed need for cls-glue.