Added Bugs to README

Added a section with the Bugs on Phabricator (which were in the git issues before)
Update README.md
Change link for bugs to links to project instead

In the README
Edit the Phabricator link in README
$.ui.suggester: Added isSearching()

Querying isSearching() allows components using the suggester to prevent subsequent actions while
searching is in progress.
Merge pull request #137 from wmde/suggesterissearching

$.ui.suggester: Added isSearching()
Added force parameter to $.AutoInputExpand.prototype.expand()