Fix installation command for Homebrew
Merge pull request #235 from sbesson/rebased/develop/homebrew_install_cmd

Homebrew installation command (rebased onto develop)
Add sections on locking and remote shares to unix/windows

This comes after several reports on the mailing lists of NFS
and CIFS installs failing.
Improve wording under system-requirements
Merge pull request #236 from joshmoore/rebased/develop/remote-mounts

Add sections on locking and remote shares to unix/windows (rebased onto develop)