Eliminate warnings when ruby is in verbose/warning mode.

Eliminates these warnings:

    “…/lib/timecop/timecop.rb:110: warning: instance variable @safe_mode not initialized”
    “…lib/timecop/time_stack_item.rb:45: warning: instance variable @travel_offset not initialized”
    “…lib/timecop/time_stack_item.rb:49: warning: instance variable @scaling_factor not initialized”
    “lib/timecop/time_stack_item.rb:140: warning: mismatched indentations at 'end' with 'class' at 1”
    “…lib/timecop/time_extensions.rb:74: warning: method redefined; discarding old now.”

For the method redefinition warning, could have used `undef :now’, but seems cleaner instead to alias :now_without_mock_time to be the old :now, rather than coding up an equivalent. (Same pattern as used in Time in the same file)

lib/timecop/time_extensions.rb

@@ -63,14 +63,12 @@ def mock_time
       mocked_time_stack_item.nil? ? nil : mocked_time_stack_item.datetime(self)
     end
 
-    def now_without_mock_time
-      Time.now_without_mock_time.to_datetime
-    end
-
     def now_with_mock_time
       mock_time || now_without_mock_time
     end
 
+    alias_method :now_without_mock_time, :now
+
     alias_method :now, :now_with_mock_time
   end
 end

lib/timecop/time_stack_item.rb

@@ -6,6 +6,7 @@ class TimeStackItem #:nodoc:
 
       def initialize(mock_type, *args)
         raise "Unknown mock_type #{mock_type}" unless [:freeze, :travel, :scale].include?(mock_type)
+        @travel_offset  = @scaling_factor = nil
         @scaling_factor = args.shift if mock_type == :scale
         @mock_type      = mock_type
         @time           = parse_time(*args)
@@ -137,4 +138,4 @@ def time_klass
         Time.respond_to?(:zone) && Time.zone ? Time.zone : Time
       end
     end
-  end
+end

lib/timecop/timecop.rb

@@ -107,7 +107,7 @@ def safe_mode=(safe)
     end
 
     def safe_mode?
-      false || @safe_mode
+      @safe_mode ||= false
     end
 
     private

test/test_helper.rb

@@ -2,6 +2,8 @@
 require 'bundler/setup'
 require 'minitest/autorun'
 
+$VERBOSE = true # enable ruby warnings
+
 begin
   require 'mocha/setup'
 rescue LoadError