use request.Session() also for HTTP POST
add chown(2), rename(2) and truncate(2). return 0755 and 0644 for stuff you can edit
read username and password from .netrc
add .rename() for JFSFiles and JFSFolders. properly rewrite JFSFile conetns. remove old cache GET entries when POST-ing
add todo
bugfix: return proper length from write(2)
new version 0.2.7 because of caching, JFS and jottafuse bug fixes, speeedups and enhancements
fix rather embarassing regression. closes #7