basic WebDAV tests
refactoring, RoboHydra tests
RoboHydra tests, URL sanitizing

* RoboHydra tests
* intelligent URL sanitizing (fixes #58, fixes #49, see issue #11, should fix #45)
Always append trailing slash to address-book/calendar home set to avoid redirections
avoid NullPointerException (hint from ANR)
Importing calendar colors from <calendar:color xmlns="http://apple.com/ns/ical/"> element (see #31)
Version bump to 0.3.8 (version code 12)
don't decode URI pathes (fixes #58), don't expect GET/POST/PUT on collections
import Apple calendar-color with r,g,b,a (see issue #31)
Merge https://github.com/rfc2822/davdroid
Add TaskContract
Some switches to distinguish between VEVENT and VTODO