Make --lock default to True. Add --nolock to provide lockless functionality when needed
Make nolock default when using luigi.build
Fixed an issue introduced in 6330e9d0332e6152996292a39c42f752b9288c96

- Previous commit introduced a bug that would cause tasks not to be exposed if they changed name after creation
- Added a new unit test for this case
- Ended up removing a lot of the code introduced in the previous commit and replaced it with a much simpler mechanism
- Removed some unit tests for unregister() since I decided that method wasn't a good idea to have
Renames flag to --no-lock and adds warning when --lock is used
Makes getpcmd and thereby process locking MacOSX-compatible
include worker id and host in log output

Makes log output more usable for troubleshooting when somewhere a worker process is hung. The "is currently run by worker-RANDOM_NUMBER" error message will now include the host, and logs on that host will let associate it with the pid.
Adding my local Vagrant bits to gitignore
Adding a target and external task for EMR output stored on S3
Fixed bugs in hive.py
Check for missing files in distributed cache setup
Merge pull request #327 from a1k0n/dcachecheck

Check for missing files in distributed cache setup
PyPI now using RST docs + uploaded new 1.0.14 version
update MANIFEST.in for new README.rst
Merge pull request #329 from mlaldrid/manifest_readme_fix

update MANIFEST.in for new README.rst
Bumped version number after fixing the broken manifest
Fixes to history page templates

* Get templates from dir relative to install
* Include templates in package data from setup.py
Merge pull request #330 from danielhfrank/history_template_fixes

Fixes to history page templates
bumped version to 1.0.16
Merge pull request #316 from spotify/freider/lock_by_default

Use process locking by default when running on command line
Merge pull request #324 from bstempi/feature/S3EmrTarget

Feature/s3 emr target