Restructure

[sweverett]

This PR implements large changes to the repo. The most important of which are:

• The repo is now a proper python module, which can be installed to the desired environment with python setup.py install. The module is called superbit_lensing and allows for easy imports in the various submodules & test files without the need for any nasty relative imports or modifications to PATH or PYTHONPATH. Submodule names have been changed slightly to conform to standards & be a bit more descriptive.
• The new utils.py file in the root dir of the module provide lots of helper classes & functions for running the pipeline as a whole. A few examples:
• • A new logging system with LogPrint that automatically handles log and / or terminal prints
• • Multiprocessing command runners that allow for terminal output
• • Functions that sort out pathing for the repo dir, module dir, test dir, etc.
• The new pipe.py file in the module root dir provides classes for each submodule that handles all of the necessary bookkeeping for running the whole pipeline (or subsets of it) sequentially through a single yaml config. This is run with the SuperBITPipeline class
• • An example run & config are given in pipe.main()
• • You can register new modules easily without understanding the full framework. Just register with pipe.MODULE_TYPES and implement the inherited abstract run() method
• An updated README to reflect these changes, particularly for pipeline runs

Closes #11, #22, #24. Implements most of #23.

[sweverett]

Note: This PR hasn't incorporated shear-profiles into the pipeline runner yet. Once I understand how to run it independently I will add it to the framework.

[mcclearyj]

Hey Spencer, the updates have been merged, so you are welcome to delete the restructure branch if and when you like