license / docs pass:

- add new docs for loading, exploring, sharing, embedding, and offline usage
- add license file / license banner

electron app:
- for now, don't bundle docs, open in native browser

embeds:
- support 'embed' option, 'replayonly' or 'full' (default if no url)

ui:
- display package.json version in info menu

package.json:
- update scripts to match README
- move electron entrypoint into extraMetadata
- add scripts for packaging as module

README: minor edits

Gemfile.lock

@@ -8,12 +8,12 @@ GEM
       eventmachine (>= 0.12.9)
       http_parser.rb (~> 0.6.0)
     eventmachine (1.2.7)
-    ffi (1.12.2)
+    ffi (1.13.0)
     forwardable-extended (2.6.0)
     http_parser.rb (0.6.0)
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
-    jekyll (3.8.6)
+    jekyll (3.8.7)
       addressable (~> 2.4)
       colorator (~> 1.0)
       em-websocket (~> 0.5)
@@ -53,7 +53,7 @@ GEM
     rb-fsevent (0.10.4)
     rb-inotify (0.10.1)
       ffi (~> 1.0)
-    rouge (3.17.0)
+    rouge (3.19.0)
     rubyzip (2.3.0)
     safe_yaml (1.0.5)
     sass (3.7.4)