Fix plugin freeze when installing non-existing plugins

Fixes #7

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 
 ### master
+- change the way plugin name is expanded. It now uses the http username
+  and password by default, like this: `https://git::@github.com/`. This prevents
+  username and password prompt (and subsequently tmux install hanging) with old
+  git versions. Fixes #7.
 
 ### v1.2.0, 2014-11-20
 - refactor tests so they can be used on travis

scripts/install_plugins.sh

@@ -16,7 +16,7 @@ clone() {
 clone_plugin() {
 	local plugin=$1
 	clone "$plugin" ||
-		clone "https://github.com/$plugin"
+		clone "https://git::@github.com/$plugin"
 }
 
 # pull new changes or clone plugin