Rough integration with file browsers.
Update image dimensions when src field is altered by keyboard and file manager.
Uncommented file browser-related paths in dev sample.
Added missing @fileOverview to Image2 plugin file.
Very simple fix to import common image plugin configuration into image2.
Quickfix for removing browse button if it's not configured.
Now hbox containing image src textbox and hidden upload button, will be removed with src textbox.
Workaround now will also consider filebrowserBrowseUrl config prop. Used standard image config property rather by image2 config prop.
Coding style fixes.