Support for Unicode pathnames and user-mount convenience

[GoodGuysFree]

Hi,

I'd like to suggest these 2 commits, to support unicode pathnames, and to help with fstab installs, by letting a non-root user mount an fstab-configured Google Drive filesystem.

Hope you'll consider these.

Thanks,

[je-vv]

For the newest release 0.14.8 your commit for ut8 requires changes.

The new patch just keeps the normal_entry.py modifications, given the opened_file.py ones are no longer required, neither match the current code:

https://github.com/dsoprea/GDriveFS/files/367583/pull_154_utf8.txt

[GoodGuysFree]

I agree that the first part of d6d8055 (gdrivefs/gdfs/opened_file.py) is no longer needed.
I am not sure about gdtool, but generally, encoding to ASCII can be problematic at times.

I feel this commit can be omitted completely.

Commit de2ce14 however, I feel is still useful.

[dsoprea]

I'm not clear on why we need this. If we receive an unsupported option, it's just forwarded to FUSE. In this case, there is no such "user" option. So, it should work fine without this change.

[GoodGuysFree]

In a previous version I received an error when I put 'user' in the options in fstab, when I wanted to make mounting the GDriveFS user-mountable. I haven't used GDriveFS in a while, so I have no problem if you simply reject it. Sorry for causing a stir.