Add ARGV.ignore_deps?

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

Library/Homebrew/cmd/upgrade.rb

@@ -29,7 +29,7 @@ module Homebrew extend self
       end
     end
 
-    unless ARGV.include? '--ignore-dependencies'
+    unless ARGV.ignore_deps?
       # Expand the outdated list to include outdated dependencies then sort and
       # reduce such that dependencies are installed first and installation is not
       # attempted twice. Sorting is implicit the way `recursive_deps` returns

Library/Homebrew/extend/ARGV.rb

@@ -89,6 +89,10 @@ module HomebrewArgvExtension
     include?('--dry-run') || switch?('n')
   end
 
+  def ignore_deps?
+    include? '--ignore-dependencies'
+  end
+
   def build_head?
     include? '--HEAD'
   end

Library/Homebrew/formula_installer.rb

@@ -16,7 +16,7 @@ class FormulaInstaller
     @f = ff
     @tab = tab
     @show_header = true
-    @ignore_deps = ARGV.include? '--ignore-dependencies' || ARGV.interactive?
+    @ignore_deps = ARGV.ignore_deps? || ARGV.interactive?
     @install_bottle = install_bottle? ff
 
     check_install_sanity