Issue/5/create basic lephareestimator class

[raphaelshirley]

Made a basic Estimator class that runs through the goldenspike example

This relates to issue 5.

I plan to merge this basic running example before moving on to improving and tidying various aspects including the parameter changes planned. I will add a basic unit test running the inform and estimate stage as another PR.

The example notebook has a link to a local repository required to get the filters and sed templates that are not yet incorporated into lephare.

It is unclear why I cannot produce a redshift density plot but only see the histograms.

Code Quality

• My code follows the code style of this project
• I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[drewoldag]

This looks ok to me. I'm sure there will be bugs, but let's push ahead. :)