* indium-v8.el: Replace websocket with wsc
* indium.el:
* Makefile: Remove dependency to websocket.el

* indium.el: Don't require indium-backend, it will be loaded by indium-chrome.el
or indium-nodejs.el.

* indium-list-scripts.el: New file.  This major mode lists all parsed scripts
  using a tabulated list.
* indium.el: Load indium-list-scripts.

Replace sourcemap.el with a modified version of the sourcemap implementation of
kite.

Fix #84

Extract script and location access to indium-script.el.
Add support for looking up original positions in indium-script.el.

Fix #59

This should fix #20.

Make sure the correct version of seq.el is loaded in Emacs 25.1.

The version of map.el shipped with emacs-25 is enough.

This makes it easier to find the package source code when browsing in
MELPA.