Merge pull request #9 from lvv/master

P4b fixes
switching to master branch of streamcorpus package
enhancing the simple streamcorpus_filter implementation in python to
handle a "token boundary" character classes that allows the state
machine to skip multiple equivalently non-word-like characters.  This
is a special subset of regex functionality.  The next one to introduce
after this is probably case-insensitivity.
updating tasks
cleaning up markdown
adding more detail to Phase 6
causing `make test` to run correctly
fixing setup.py for `make test`
fixing indents in markdown
improving phase 5a description
refining p6
Merge branch 'master' of https://github.com/trec-kba/streamcorpus-filter