Merge branch 'release/v0.2.0' into develop
[#13] Configure default config, using environment variables.

Implement config.js, which specifies default config, which may be
overridden using environment variables.

Logged config when server is started.

Changed default port to 3000, removing setting from app itself.
Merge branch 'enhancement/13-default-env-vars' into develop
[#10] Fix README relative URLs.
Merge branch 'doc/10-readme-urls' into develop
[#15] Fix multiple replays, replacing pages_objects.{index => show}.

Replays were run multiple times, once per object, because each request
fetched the data for all objects (pages_objects.index). In addition,
much of the structure of unmoved.js was faulty.

Rewrote unmoved.js structure, retaining one request being sent per
object, but fetching data for that object only. Thus, replaced

    GET /pages/:page_id/objects

with

    GET /pages/:page_id/objects/:object_id

for both the server and unmoved.js.

Multiple requests were retained, to facilitate the possibility of
calling unmoved() on objects in stages, rather than all at once.
Merge branch 'bug/15-multiple-replays' into develop
[#1] Improve unmoved.js transition for replay, teleporting.

Change to fade half-way, fetch data, move if possible, then fade back up.
Merge branch 'enhancement/1-teleport' into develop
[#11] Fix Redis database not selected.

Passing the REDIS_URL connection to redis-url does not select the Redis
database; hence, database 0 is always selected, as that is the default.

Fix to detect terminating database number, selecting such, if set.
Merge branch 'bug/11-redis-db' into develop
Bump version to v0.3.0.
Merge branch 'release/v0.3.0'