Remove BifidExpert, make ValueView handle static mode

Bug: 56259
Bug: 55693
Make sure prevVal is correct in successive eachchange events
Merge pull request #33 from wmde/removeBifidExpert

Remove BifidExpert, make ValueView handle static mode
Don't redraw ValueView in {en,dis}able if nothing changed
Merge pull request #27 from wmde/ValueViewToggle

Don't redraw ValueView in {en,dis}able if nothing changed
Update README.md
Bump version 0.4
Require data-values/javascript 0.4
Bump version 0.4.1
Update README.md
Renamed ExpertFactory to ExpertStore
Update to DataValuesJavaScript version 0.4.0
Removed mw.ext.valueView