add a script to do a run
tidy up non-deterministic bits

Close files immediately when they exit scope (even if they aren't
reference-counted, i.e. because this is running on PyPy). And, sort dicts and
sets whenever our results are influenced by the order they are processed.
use nltk tagger (default) instead of Stanford
Merge branch 'master' of https://github.com/lamber/gc into 5_nltk_tagger

Conflicts:
	SConstruct
Merge branch 'master' of https://github.com/lamber/gc
Merge branch '5_nltk_tagger'
WIP
bugfixes/tidy-ups for run-em-all.sh
Merge branch 'master' of https://github.com/lamber/gc

Conflicts:
	SConstruct
WIP
Merge branch 'master' of https://github.com/lamber/gc

Conflicts:
	SConstruct
fix unit tests that said they couldn't compare list to set
WIP
remove insertables and deletables from unit test
Merge branch 'master' of https://github.com/zooko/gc
Put back link pathname to tagger model.