python-caldav: Recipe cleanups; Fixed missing dep
python-caldav: Recipe cleanups; Fixed missing dep

- Updated the recipe according to the feedback on mailinglist
- Added missing installation depenencies

Tested building on Ubuntu 10.10 x86_64 for beagleboard rev. c4.
Tested installation and functionality on beagleboard rev. c4.

Signed-off-by: Lars Michelsen <93ed4a0a3d0e1873efad9e42341ac36b31958df6@larsmichelsen.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

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