Convert \t, \n and \r in attributes

Testcase:
var s = "";
for(var i = 0; i <= 60; ++i)
	s += String.fromCharCode(i) + "|";
alert(<x a={s}>{s}</x>.toXMLString());
Add icon:
built-in /chrome/icons/default/custombuttonsEditor.ico
+ modified Diagona http://www.iconfinder.com/icondetails/14110/10/preferences_tool_icon
Bump version to 0.1.0a8 - 2013-02-05
Add links to forum topics
Install page for v. 0.1.0a8 - 2013-02-05
Update description:
* add icon
* add link to install page
* add usage notes