Also gsub! some particular formula contents to work around older
formulae ("brewkit" isn't around anymore, and url is expected to
be a method, not an instance variable).
- Removed use of FormulaVersions - it's generally too brittle for our uses. We
now interface directly with the Git repo via utils/git and monkeypatch the
formula loading process where needed.
- Really old formulae (that specify fields as instance vars instead of methods)
still need more work to be supported; they don't work here quite yet.
- Properly handles deleted/removed formulae from Homebrew/homebrew-core.
Additional work is still needed to search through Homebrew/legacy-homebrew if
this functionality is desired.
- Rework command line options
- Make specifying a version optional
- Remove stdout option and require a tap to be specified
- Do not allow user to extract into homebrew/core
- Rework new class name generation to use existing Formulary tools
