Pypette

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**Improvement**

* Extending Pipe to handle and capture exceptions gracefully.
* Extending Pipe to have modes:
* FAIL_FAST : Where an exception stops the execution of further stages.
* EXECUTE_ALL : Where an exception doesn't stop the execution of further
stages.
* Adding ability to specify dependency on other pipelines.
* Adding ability of reporting.

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**Improvement**

* Making `Job` accept all python callables.
* Increasing the test coverage by adding basic tests for run().

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**Bugfixes**

* BashJob doesn't wait till thread is run. Fix with lambda.

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**Improvement**

* Support for bash commands using BashJob.

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**Bugfixes**

* Continuous build deprecated test fixes.

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**Improvement**

* Test coverage.
* Continuous build integration with Travis.
* Continuous coverage integration with Coveralls.