Reuse DOM
Merge pull request #35 from wmde/reuseDom

Reuse DOM
Renamed ExpertFactory to ExpertStore
Update to DataValuesJavaScript version 0.4.0
Don't initialize formatter in _updateTextValue if no value to format
Merge pull request #38 from wmde/dontInitFormatterWithoutValue

Don't initialize formatter in _updateTextValue if no value to format
Removed mw.ext.valueView
Merge pull request #34 from wmde/rmmwext

Removed mw.ext.valueView
Handle single parameter returned by rejected ValueFormatter/Parser promise