correct the submodule paths for my plugins

.gitmodules

@@ -15,13 +15,13 @@
 	url = https://github.com/tpope/vim-ragtag.git
 [submodule "bundle/nerdtree"]
 	path = bundle/nerdtree
-	url = git@github.com:scrooloose/nerdtree.git
+	url = https://github.com/scrooloose/nerdtree.git
 [submodule "bundle/nerdcommenter"]
 	path = bundle/nerdcommenter
-	url = git@github.com:scrooloose/nerdcommenter.git
+	url = https://github.com/scrooloose/nerdcommenter.git
 [submodule "bundle/syntastic"]
 	path = bundle/syntastic
-	url = git@github.com:scrooloose/syntastic.git
+	url = https://github.com/scrooloose/syntastic.git
 [submodule "bundle/csapprox"]
 	path = bundle/csapprox
 	url = https://github.com/godlygeek/csapprox.git
@@ -52,6 +52,9 @@
 [submodule "bundle/markdown-runtime"]
 	path = bundle/markdown-runtime
 	url = https://github.com/tpope/vim-markdown.git
+[submodule "bundle/ultisnips"]
+	path = bundle/ultisnips
+	url = https://github.com/vim-scripts/UltiSnips.git
 [submodule "bundle/gundo"]
 	path = bundle/gundo
 	url = https://github.com/sjl/gundo.vim.git