Blaster

Fixed
- Do not process any more tasks if previous tasks fails. This is only when
running tasks sequentially.

Changed
- This release provides the ability for users to define a delay between
starting processes. By default, this delay is 5 seconds.

Changed
- This release brings maintenance throughout all modules.

Added
- Ability to run a sequence of tasks in parallel or sequentially.

Added
- Added unit tests to gain code coverage.
- Travis CI enabled for all pushes to master branch or pull requests.
- Coveralls added to keep code coverage results per commits.

Changed
- Updated doc strings for all modules.
- Updated README.md.

Fixed
- Fix bug that was not allowing task method traceback to be saved when a
failure happened.
- Fix bug that was not having blaster task id saved within each task.

Changed
- Ability to determine the number of processes to spawn when processing tasks.