[ecloud] mark bin specs pending unless credentials provided

closes #325

spec/ecloud/bin_spec.rb

@@ -1,19 +1,25 @@
 require 'ecloud/spec_helper'
 
 describe 'Ecloud' do
-  it { Ecloud.should be_available }
 
-  it { Ecloud.should have_at_least(1).services }
+  it do
+    pending unless Ecloud.available?
+    Ecloud.should have_at_least(1).services
+  end
 
   describe "when indexing it like an array" do
+
+
     describe "with a service that exists" do
       it "should return something when indexed with a configured service" do
+        pending unless Ecloud.available?
         Ecloud[:compute].should_not be_nil
       end
     end
 
     describe "with a service that does not exist" do
       it "should raise an ArgumentError" do
+        pending unless Ecloud.available?
         lambda {Ecloud[:foozle]}.should raise_error(ArgumentError)
       end
     end