Added .delete function
Added prefix to pass PouchDB tests
working tests
pre-merge tests
Merge branch 'qs44-pouchDB44-delete-function-in-index' of https://github.com/calvinmetcalf/level.js into qs44-pouchDB44-delete-function-in-index
Merge pull request #29 from qs44/qs44-pouchDB44-delete-function-in-index

Added .delete function