Added join functions to TypedPipe and tests
Revert "Added join functions to TypedPipe and tests"

This reverts commit a4f948b63951547f2d35671979f06dfe337b138d.
add spill threshold test
Merge pull request #539 from twitter/feature/add_test

Adds SpillThreshold Test
Merge remote-tracking branch 'upstream/develop' into develop
Moved the new join methods into a separate class and added implicits
Merge pull request #528 from vitalyg/develop

Added join functions to TypedPipe and tests