Escape XML for methodName anche className

Hi,

I've found an error while sending stacktrace in the XML.
in particular my application uses ORMLite and the stacktrace contains:
```xml
<line method="org.sqlite.PrepStmt.<init>" file="PrepStmt.java" number="42"/>
```
The `<init>` method name makes XML syntax invalid.
So I have added `NoticeXml.escapeXml` to `methodName` and, just for sure, to `className`.

Hope this can help

Fabio