Mounts table for Darwin.

Associated with #255, this adds Mounts table support for Darwin.
Merge branch 'master' into mounts_table
Format fixes.

- ran clang-format.
- lowercased column names for table.
- removed include for boost as it's no longer being used.
Merge branch 'master' into mounts_table
Merge pull request #440 from mgoffin/mounts_table

Mounts table for OSX