added support for manual journals
fix manual journal obj not found exception properly
upgrade libxml-ruby to up to date version
remove some deprecation from tests
Merge branch 'forked/master' into fix_handle_object_not_found_for_manual_journal

Conflicts:
	CHANGELOG.textile
	Rakefile
	lib/xero_gateway/manual_journal.rb
	test/test_helper.rb
	xero_gateway.gemspec
Merge pull request #47 from sharesight/fix_handle_object_not_found_for_manual_journal

Fix handle object not found for manual journal