Refactored @mmb's fix to --verify; updated docs.

Closes #32.

httpie/__main__.py

@@ -131,13 +131,6 @@ def main(args=None,
     elif not files and 'Content-Type' not in headers:
         headers['Content-Type'] = TYPE_FORM
 
-    if args.verify == 'yes':
-        verify = True
-    elif args.verify == 'no':
-        verify = False
-    else:
-        verify = args.verify
-
     # Fire the request.
     try:
         response = requests.request(
@@ -145,7 +138,7 @@ def main(args=None,
             url=args.url if '://' in args.url else 'http://%s' % args.url,
             headers=headers,
             data=data,
-            verify=verify,
+            verify={'yes': True, 'no': False}.get(args.verify, args.verify),
             timeout=args.timeout,
             auth=(args.auth.key, args.auth.value) if args.auth else None,
             proxies=dict((p.key, p.value) for p in args.proxy),