deleted redundant Nest patch and incorporated merge patch into pipeline builder. not sure what i think about that.
code cleanup (try to use reviseHistory instead of manual machinery)
Merge branch 'master' of github.com:slamdata/slamengine
massive refactoring of pipeline phase, pipeline builder, etc. compiles clean but many tests fail
fix a few bugs
code cleanup
fix a few bugs (repatch already patched things)
get all pipeline merge tests passing again... or at least all the ones that were formerly passing
fix a few issues with the pipeline phase
disable the one new failure
merge