Pass options to libfuse with -o parameter

[ritiek]

Closes #22.

Now I can do:

$ boxfs -o allow_other ~/box

:D

Multiple options can be passed separated by a comma like:

$ boxfs -o allow_other,default_permissions ~/box

[drotiro]

Hi, thank you!
I checked out your patch in a branch to test it and got a segfault at program start.
I'll do a bit of debugging and merge when it runs on my laptop.

D.

[ritiek]

Heh. I wouldn't be surprised. I hardly have any experience with managing my own memory. But at least for some reason it works fine on my Pi 2 and my x64 machine.