Pin to version 2.6.6 of empty.html.

2.7.0 has unicode errors as described in:

    https://github.com/TiddlyWiki/tiddlywiki/issues/115
Keep TiddlyWiki client code local to this repo

More findable.
Make README markdown
Update README

* more info
* pointers to documentation
* markdown
* friendly tone(?)
Get rid of out of date dox
Keep tiddlywiki resources local and update to pass tests

this includes the empty.html, currently pinned at 2.6.6

The instanceu.py and Makefile required adjustment to be
aware of new file locations.
pep8 defaults
pep8 cleanups
Use update twanager command from instancer, not local.
Don't modify config at global level.

This means that any test file which follows a test file
that imports the fixtures will get the modified config
settings without ever being aware of the change.

In this particular case the setting was never needed,
so just removing it.
pep8 and pyflakes test cleanups
Take advantage of modern model.collections.Tiddlers

This helps to make 'browseable_url' less of a chore to create.
README typo fixes
Merge pull request #15 from tiddlyweb/modernize-2013

Modernize 2013