Escaped password when saving .properties file

If the user's password contains a '\', it will be stored verbatim in the project's .properties file. When this file is read by the Properties class in tooling-force.com.jar, this will be interpreted as an escaping character (see: http://docs.oracle.com/javase/7/docs/api/java/util/Properties.html#load%28java.io.Reader%29) and the authentication won't work, since the '\' dropped in any case.

This is what happened to me :) 

To fix this I added an invocation to the escape() function to escape the '\' in the apexProject.vim file, where the password is stored.