Fixed typo in README
Merge pull request #263 from jamesrhurst/readme

Fixed typo in README
Test run to allow any files in openPanel
Using instancetype instead of id
Searching for a workaround for NSOpenPanel validation bug
Using hacked refresh (which doesn't seem to work)
Fixes #250. Found workaround to force a refresh by toggleing showHiddenFiles.
clearing undo-stack (#265)
KeePassHttp support