v1.0.0-beta4 – Template bindings rewrite

Notable changes:

• In addition to header templates [[column]] is now available also in row cell templates
• Most column properties are no longer notify: true because they don't change internally
• row-detail template no updates properly [[item]] changes
• row-detail template can be now injected from a parent component using <content>
• beforeCellBind is now called also for header cells
• selectItem can now be used even if selectionEnabled is false
• Expanding and Selecting the first row should now work
• Header cell container width now takes vertical scrollbar into account