Charlie Sharpsteen 93dca5fb38 upgrade.rb: Generate Tab from Keg not Formula
Two issues were preventing `brew upgrade` from functioning properly:

  - `Tab.for_formula` was used to recover options from prior installs. The
    problem is that during an upgrade `for_formula` will be directed to a
    non-existant install of the newer version and thus returns a forged tab
    claiming no options were invoked.

  - The assignment to `installer.install_bottle` requires parenthesis in order
    to function properly.
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