Avoid mixing IceCube into the global namespace

Until specs can be adjusted to reference IceCube objects explicitly, this
permits lookup for the commonly used IceCube constants only, without polluting
the global Object namespace with all methods and constants from IceCube.

Author: avit

spec/examples/occurrence_spec.rb

@@ -1,7 +1,5 @@
 require File.dirname(__FILE__) + '/../spec_helper'
 
-include IceCube
-
 describe Occurrence do
 
   it "reports as a Time" do

spec/examples/recur_spec.rb

@@ -1,7 +1,5 @@
 require File.dirname(__FILE__) + '/../spec_helper'
 
-include IceCube
-
 describe :remaining_occurrences do
 
   it 'should get the proper remaining occurrences from now' do

spec/spec_helper.rb

@@ -19,6 +19,17 @@
   'Pacific/Auckland',   # +1200 / +1300
 ]
 
+# TODO: enable warnings here and update specs to call IceCube objects correctly
+def Object.const_missing(sym)
+  case sym
+  when :Schedule, :Rule, :Occurrence, :TimeUtil, :ONE_DAY, :ONE_HOUR, :ONE_MINUTE
+    # warn "Use IceCube::#{sym}", caller[0]
+    IceCube.const_get(sym)
+  else
+    super
+  end
+end
+
 RSpec.configure do |config|
   # Enable flags like --only-failures and --next-failure
   config.example_status_persistence_file_path = ".rspec_status"