add regex dispatcher
resource uses RegexDispatcher
fix resource_csv_name
resource on sql
break out resource calls to other files
add resource to top level namespace
tmpfile prepends . if none exists
resource on hdf5
register blaze:// protocol to ExprClient

Too soon?
Table uses resource if first input is string
remove old resource, repurpose tests for new resource
replace use of copy with into in tests
move old resource tests to new resource test file
move over last vestiges of blaze/data/usability.py
Merge pull request #540 from cpcloud/chdoig-chdoig/by_change

Make By expressions only take a single argument
into SQL <- CSV returns sql
api: Table.__repr__ on empty results
into SQL <- CSV returns sql
Merge pull request #542 from mrocklin/repr-empty

Two small fixes
isn't it "Matt Rocklin" instead of "Matt Rockin"?