Configure basic ctags for javascript projects

There are, apparently, more things we need to configure. @BlakeWilliams shared
http://dance.computer.dance/posts/2015/04/using-ctags-on-modern-javascript.html
which outlines a bunch more things that don't work out of the box. For
example, ES2015 classes and their methods are not properly found, even
with this PR. There's more work to do here.

ctags

@@ -13,3 +13,11 @@
 --regex-Elixir=/^[ \t]*defprotocol[ \t]+([A-Z][a-zA-Z0-9_]*\.)*([A-Z][a-zA-Z0-9_?!]*)/\2/p,protocols,protocols (defprotocol...)/
 --regex-Elixir=/^[ \t]*Record\.defrecord[ \t]+:([a-zA-Z0-9_]+)/\1/r,records,records (defrecord...)/
 --regex-Elixir=/^[ \t]*test[ \t]+\"([a-z_][a-zA-Z0-9_?! ]*)\"*/\1/t,tests,tests (test ...)/
+--exclude=bower_components
+--exclude=node_modules
+--exclude=vendor
+--languages=-javascript
+--langdef=js
+--langmap=js:.js
+--langmap=js:+.jsx
+--regex-js=/[ \t.]([A-Z][A-Z0-9._$]+)[ \t]*[=:][ \t]*([0-9"'\[\{]|null)/\1/n,constant/