Editor readme

The following outlines the quirks the developer found in the dijit.editor.

Quirks in IE
1) IE iframe/designmode uses <p> tag for ENTER key, this creates problem as <p> has margin settings in browsers. We need to normalize the <p> to <div>.
2) dijit._editor.RichText plugins EnterKeyHandling has a variable blockNodeForEnter 
3) IE doesn't like <br/> very much, it has problem navigate the cursor using up/down arrow
4) when does it generate <p> vs <div> when ENTER key is hit
-- if editor has no preexisting data, ENTER key will generate <p>, which cause problem in IE browser because 
of the default css style for <p> has margin. For this to work, add "&nbsp;" as content to the editor, then 
ENTER key will generate <div>.
5) setValue("&nbsp;") will generate a <p> tag, do setValue("<div>&nbsp;</div>")

6) TAB key tab to the editor but no cursor 
-- set the iframe.body to have tabIndex = -1
-- alternatively, by having "<div>&nbsp;</div>", tab will work as well
-- Again, if no data in the editor, TAB tabs to the editor but no cursor. For this to work, add "&nbsp".

7) add Link, smiley or open other pull down menu will go to the end of the html tag 
Example:
To see this problem, compose with Signature has predefined 

cursor
<br>
<br> 
--
<signature>

before the signature. If position the cursor at the beginning of the first <br>, then add smiley, link or 
open other pull down menu reposition the cursor moves to the end of the second <br>.

<br>
<br>
smiley --
<signature>

instead of 

smiley
<br>
<br>
--
<signature>


<end of example>

This is because in IE, the var bm = range.getBookmark() and range.moveToBookmark(bm) do not work correctly, the 
moveToBookmark(bm) seems to move to the end of the html tag, i.e., 2nd <br> in this case until a text character is
encountered. To work around this problem, keep the range when focus is blur and then use the saved range.select()
to reselect the selection.

-- this problem also got migitated by adding "<div>&nbsp;</div>", only if the cursor does not position after the &nbsp;