Get rid of the tw2gen wiki

Instead, we'll use the tw2 wiki provided as part of tw5
Ignore Mac OS X .DS_Store files
Adjust batch files to pass wiki path as first argument

Instead of all that clumsy changing the current directory.
Docs updates
More docs update
Use tiddlywiki.js rather than boot.js

tiddlywiki.js is the top level entry point for TW5
Make the TW5 directories be relative to the current working directory
Be more specific about tiddlywiki recipe location
Merge pull request #7 from Jermolene/master

Adapt to recent improvements in TW5