Update README
Merge pull request #259 from arlandism/update-readme

Update midje-cascalog README
append to Cascading frameworks system property instead of setting it directly
Bump jackknife to 0.1.7 in cascalog-checkpoint.
Merge pull request #263 from fs111/develop

append to Cascading frameworks system property instead of setting it direclty
Merge pull request #264 from dajac/jackknife

Use jackknife 0.1.7 everywhere
allow tests from clojure and cascading implementation (w/ incomplete clj impl)
allow buffer to handle prepared functions (which appears to be Cascading specific)
allow nullable vars in the in-memory platform
add a test file to include in-memory tests (this should be removed later)
add a few more tests to in-memory platform
fix multi-parallel aggregator
move tests that are currently cascading specific into the proper test file
improve testing suite to handle multiple bindings for in-memory platform
allow log levels to appear in in-memory platform tests

- remove spill tests from in-memory tests
fix join ordering
get ParallelBuffer working with limit-rank
api-test now runs tests on cascading platform and the in-memory platform
add cascading context to jcascalog test
update secondary tests with current progress for in-memory platform tests passing