Knife cloud test utils

Opening a PR for review.
This branch is re-based with undergoing development of knife cloud and contains changes for knife cloud test utility.

To use this library user will have to update the spec_helper with

require 'rspec/knife-cloud/test_bed'

and,  include the required modules (include KnifeTestBed, include RSpec::KnifeTestUtils) in the respective describe block. init_test should be called to create test bed and cleanup_test_data for cleaning up the test data. for instance;


	describe 'knife-vcloud' do
		
		include KnifeTestBed
		include RSpec::KnifeTestUtils
		before(:all) { init_test }
		after(:all) { cleanup_test_data }

		#Example Tests followed
		context 'gem' do
			
			context 'build' do
				let(:command) { "gem build knife-vcloud.gemspec" }
				it 'should succeed' do
					match_status("should succeed")
				end
			end
			
			context 'install ' do
				let(:command) { "gem install " + get_gem_file_name } 
				it 'should succeed' do
					match_status("should succeed")
				end
			end

		end
	end