Add DB ext plugin

We'll see how useful this ends up being...

.gitmodules

@@ -94,3 +94,7 @@
 	path = vim/bundle/vim-cucumber
 	url = https://github.com/tpope/vim-cucumber.git
   ignore = dirty
+[submodule "vim/bundle/dbext.vim"]
+	path = vim/bundle/dbext.vim
+	url = https://github.com/vim-scripts/dbext.vim.git
+  ignore = dirty

vim/bundle/dbext.vim

@@ -0,0 +1 @@
+Subproject commit d44fd5cca10c466c0eb3d6f7b18c4b13f5bf24d7