Add Homebrew installation information.

Until the Homebrew Formula pull request is accepted, install via
linked formula file.
README: Formatting changes. Clarify pair/rogue in Client Commands.
Typo fix: severs should be servers
Merge pull request #7 from wwilkins/patch-1

Typo fix: severs should be servers
Wrap $@ in quotes to pass arguments correctly.

$@ has been changed to "$@". Without the quotes individual words in passed
strings were considered separate arguments.
s/sever/server/g
Warn about tmux version requirement
Adds the option to override host mode

This change allows a host user to pass "client" as the first
command-line argument in order to access the client mode commands.
Merge pull request #10 from geeksam/patch-1

s/sever/server/g - Oops!
Merge pull request #12 from rubycut/patch-1

Warn about tmux version requirement
Merge pull request #13 from jballanc/client-mode-override

Add the option for host to join in client mode.
Change ps command to lsof for kick_user
Merge pull request #20 from DexterTheDragon/fix_kick_user

Change ps command to lsof for kick_user
Fix shebang line to be more universal.
Merge pull request #24 from trq/feature/fix-shebang

Fix shebang line to be more universal.
Fix typo in the template of the socket_prefix variable
Merge pull request #27 from elisiano/patch-1

Fix typo in the template of the socket_prefix variable in conf.
Merge branch 'master' into summon

Let me know if summoning is your bag or not!

Conflicts:
	wemux