failure setting for missing tables on partition target

- resolved merge issues
If the user interrupts the job, kill it
Some of the db/table calls were reversed.
Merge pull request #65 from jcrobak/fix-mixedup-db-table

Some of the db/table calls were reversed.
Merge pull request #57 from rathboma/master

Added a flag to HivePartitionTarget to prevent failure if a table doesn't exist
Merge pull request #64 from erikbern/kill-interrupted-hadoop-jobs

If the user interrupts the job, kill it
typo
Merge pull request #67 from rathboma/master

Sorry -- missing colon :-(
added travis-ci support
Merge pull request #68 from erikbern/travis-ci

added travis-ci support
luigi grep utility.

Utility to search the luigi API using a prefix or a status.
Merge pull request #71 from jcrobak/luigi-grep

luigi grep utility.