temporarily use the FlowPanel as Editor, the inner rich text area can not automatically adjust the height and width

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522299 13f79535-47bb-0310-9956-ffa450edef68
change the text box to text area of input type in compose panel, and set its width and height

git-svn-id: https://svn.apache.org/repos/asf/james/hupa/trunk@1522300 13f79535-47bb-0310-9956-ffa450edef68