Issue #54 Method suggestion proposal

httpie/__main__.py

@@ -1,4 +1,5 @@
 #!/usr/bin/env python
+import re
 import sys
 import json
 
@@ -40,6 +41,12 @@ def _get_response(parser, args, stdin, stdin_isatty):
         # Form
         args.headers['Content-Type'] = TYPE_FORM
 
+    if args.method is None and not args.items:
+        args.method = 'GET'
+    elif not re.match('^[a-zA-Z]+$', args.method):
+        args.items.insert(0, args.url)
+        args.method, args.url = 'POST', args.method
+
     # Fire the request.
     try:
         credentials = None

httpie/cli.py

@@ -171,6 +171,8 @@ parser.add_argument(
 
 parser.add_argument(
     'method', metavar='METHOD',
+    nargs='?',
+    default=None,
     help=_('''
         The HTTP method to be used for the request
         (GET, POST, PUT, DELETE, PATCH, ...).