bump version to 0.2.1+dev
fix tests to pass even if pandas is not installed
Make patsy.builtins visible to py2app/py2exe as well
overhaul index and num_rows handling in build_design_matrices

new argument data_index; better handling for

Still needs:
- tests for data_index and data.index
- data_index argument added to highlevel interface
- changes.rst (esp. that "~ 1" can now raise an error if data_index= not given)
change data_index= to index=, and better tests
Changed my mind and reverted the addition of index=

Instead I think what I really want is proper support for ancillary
matrices, which provide an elegant solution to the "implicit data"
problem I'm running into in pyrerp, and are also useful for things
like weights= arguments.

Did keep some parts of the changes, though; see changes.rst.
oops, guess .origin is a required attribute on factors, so document it
remove accidental reference to defunct index= argument from error message
update slow test to handle new no-data-dependence->error world, should fix travis build
fix chopped off line in docs
[travis] attempt to set up coveralls
[travis] restrict coveralls to python 2.7 and 3.3, since the coveralls library doesn't seem to support old pythons (too bad this means we'll never see coverage of our backwards compat code, but oh well...)
[travis] actually, enable coveralls on py26 too, since it seems to work
add test and coverage badges to README
add README.rst
clean up README.rst formatting
switch over to README.rst for everything
fix doc typo
Add some more packages to the downstream users list
add pandas interdoc link