Ignore .swp files in nerdtree with vim, add .cap file as ruby

vimrc

@@ -75,7 +75,7 @@ map <F12> ggVGg?  " apply rot13 for people snooping over shoulder, good fun
 
 " Nerdtree settings
 let NERDTreeDirArrows=1
-let NERDTreeIgnore = ['\.pyc$']
+let NERDTreeIgnore = ['\.pyc$', '\.swp$']
 
 let g:ale_linters = {
 \   'javascript': ['eslint']
@@ -181,6 +181,10 @@ augroup javascript
     au! BufRead,BufNewFile *.js.flow set filetype=javascript
 augroup END
 
+augroup ruby
+    au! BufRead,BufNewFile *.cap set syntax=ruby
+augroup END
+
 augroup styl
     au! BufRead,BufNewFile *.styl set syntax=stylus
 augroup END