Refactor the bash completion script

The script was lacking structure and had grown a number of one-off hacks
that would be better as reusable functions. So,

 - give each subcommand that has completions it's own function
 - move completion of formulae, installed brews, and outdated brews into
   reusable functions
 - introduce a general __brewcomp() function that takes a string of tab,
   space, and/or newline separated items and converts all seperators to
   newlines, and then generates a reply with compgen().

These changes should allow for easier addition of new features in the
future.

As a bonus, completion for `brew log` will include git-log options if
the git completion script is also loaded.

_brew_to_completion() is kept around for compatiblity.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

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