Easier way to define new languages

Add more test cases

Also fixed some style issues

TODO: split tests up in multiple files, e.g. test/test_html_syntax.vader

test/install.sh

@@ -8,6 +8,7 @@ repos=(
   'digitaltoad/vim-pug'
   'groenewege/vim-less'
   'kchmck/vim-coffee-script'
+  'leafgarland/typescript-vim'
   'slm-lang/vim-slm'
   'wavded/vim-stylus'
 )