Merge pull request #28 from dimagi/cz

pull out passes filter functionality into it's own function
Make sum the default for date emitters
Fix failing tests
Merge pull request #29 from dimagi/default_date_emitter

Make sum the default for date emitters
allow per emitter group_by
make domain and doc_type filter optional
Merge pull request #31 from dimagi/optional_domain_filter

make domain and doc_type filter optional
Merge pull request #30 from dimagi/group_by_extension

allow per emitter group_by
add base command to fast reindex fluff data
Merge pull request #32 from dimagi/fast-reindex

add base command to fast reindex fluff data
Remove MC import line
Merge pull request #33 from dimagi/remove-mc-code

Remove MC import line
don't use the file view system, just iterate over the view directly
Merge pull request #34 from dimagi/fast-reindex

don't use the file view system, just iterate over the view directly
keeping up with stupidity
Merge pull request #35 from dimagi/stupity_removal

keeping up with stupidity
add filter classes
add simple calculator
generic fluff reindexer
normalize output to dict format