Delete envelope recipient

Conflicts:
	lib/docusign_rest/client.rb
	test/docusign_rest/client_test.rb
add support for numberTabs in get_template_roles to allow pre-filling numeric values in envelope creation from templates
add ability to void an envelope
added #get_envelope_audit_events method
API for the combined PDF for a given envelope ID

Needed this. Didn't see that is was provided.
Add creation of an envelope from a composite template of server templates
Fix merge conflict