[#4182] Added an OverheadBudget to track a Deliverable's overhead.

app/models/overhead_budget.rb

@@ -0,0 +1,18 @@
+class OverheadBudget < ActiveRecord::Base
+  unloadable
+
+  # Associations
+  belongs_to :deliverable
+
+  # Validations
+
+  # Accessors
+
+  def budget=(v)
+    if v.is_a? String
+      write_attribute(:budget, v.gsub(/[$ ,]/, ''))
+    else
+      write_attribute(:budget, v)
+    end
+  end
+end