Make time specs timezone independent

* Changed spec to add getutc to lock specced time to UTC

* Time.now automagically converts to_local; this means the test suite
  passes in olbrich's timezone but not in the other 23/24ths of the
  Earth ;-)

spec/ruby-units/time_spec.rb

@@ -8,23 +8,23 @@
 
   context ".at" do
     subject { Date.new(2011,4,1).to_unit }
-    specify { Time.at(subject - Date.new(1970,1,1)).strftime("%D %T").should == "03/31/11 20:00:00"}
+    specify { Time.at(subject - Date.new(1970,1,1)).getutc.strftime("%D %T").should == "04/01/11 00:00:00"}
     specify { Time.at(subject - Date.new(1970,1,1), 500).usec.should == 500}
   end
-  
+
   context ".in" do
     specify { Time.in("5 min").should be_a Time}
     specify { Time.in("5 min").should > Time.now}
   end
-  
+
   context '#to_unit' do
     subject { now }
     its(:to_unit)         { should be_an_instance_of(Unit) }
     its('to_unit.units')  { should == "s" }
     specify               { subject.to_unit('h').kind.should == :time}
     specify               { subject.to_unit('h').units.should == 'h'}
   end
-  
+
   context 'addition (+)' do
     specify { (Time.now + 1).should == Time.at(1303656390 + 1)}
     specify { (Time.now + Unit("10 min")).should == Time.at(1303656390 + 600)}
@@ -36,4 +36,4 @@
     specify { (Time.now - Unit("150 years")).should == Time.parse("1861-04-24 09:46:30 -0500")}
   end
 
-end
+end