[vim] Remove elm.vim

For some reason, it was setting `commentstring` for Ruby files?

.gitmodules

@@ -97,9 +97,6 @@
 [submodule ".vim/bundle/vim-projectionist"]
 	path = .vim/bundle/vim-projectionist
 	url = git://github.com/tpope/vim-projectionist.git
-[submodule ".vim/bundle/elm.vim"]
-	path = .vim/bundle/elm.vim
-	url = git://github.com/lambdatoast/elm.vim.git
 [submodule ".vim/bundle/vim-rake"]
 	path = .vim/bundle/vim-rake
 	url = git@github.com:tpope/vim-rake.git

.vim/bundle/elm.vim

@@ -1 +0,0 @@
-Subproject commit 5f8c518cb0c0d3dc9a54a5074b618f897ee34ef9