[Owncloud] Increasing OwnCloud's Number of Recognized Filetypes (file included)

[Bugsbane]

Hi there,

OwnCloud not recognising Calligra file extensions (.odp,.odt,ods,.odp) 
was causing me all sorts of headaches, so I've edited my filestorage.php 
to recognize 42 filetypes (up from 17). Can someone look this over and 
commit it if it's ok. Git (and all VCS's) scramble my brain. IANAC. It 
works fine on my system as far as I can see.

Thanks!
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