Maid 149 drive permissions

This pull request forces the drive permissions to be fixed to rw for user, and inaccessible for all others when using FUSE. A member variable was added to the base drive class so that options given to the process (in an upcoming patch) could select the permissions for the user, group, and everyone. No changes for Windows ACL have been done yet. I hope to get a Windows 8.1 VM running soon to add similar features to CBFS.