Update github.com/sirupsen/logrus to v1.2.0

Also deals with its name change of "Sirupsen" to "sirupsen".

Convert dependencies to dep tool

Move from "godep" to "dep" for dependency management. It's going to be
the future.

Interestingly, "dep" insists on putting the entire repos of my
dependencies in the vendor directory (instead of just the packages
used). I'd rather not have all of Consul mirrored here, so "vendor/" is
removed. I suppose this also makes it easier to import the filesystem as
a dependency.

Disallow metadata via mount options

Adds NoAppleDouble and NoAppleXattr to the default mount options.
AppleDouble is the technique of storing extended attributes in regular
files (._*). NoAppleXattr prevents Finder from looking for "com.apple.*"
xattrs.

Neither of these options prevent the "session" xattr from being read.

Initial commit of ConsulFS