Add rule to remove a doubled-up "git clone" in a git clone command. (#1106)

Some git hosts will copy the entire clone command, while others just
copy the url, so typing "git clone ", then pasting a git url that
already has a "git clone " on the front is a somewhat common issue.

thefuck/rules/git_clone_git_clone.py

@@ -0,0 +1,12 @@
+from thefuck.specific.git import git_support
+
+
+@git_support
+def match(command):
+    return (' git clone ' in command.script
+            and 'fatal: Too many arguments.' in command.output)
+
+
+@git_support
+def get_new_command(command):
+    return command.script.replace(' git clone ', ' ', 1)