Implementing Firebase SDK Initialization and Custom Authentication (#1)

* Initial code contribution with auth API implementation and unit tests
* Added linter integration
* Added link to pylint docs
* Improved linter script and documentation
* Updated tests to use pytest; Updated lint.sh to use one config file instead of two.
* Updated documentation
* Updated documentation
* Changed max line length to 100; Updated documentation; Using the mock private key from Node SDK tests for testing
* Changing mock crypto field names; Implementing other suggested improvements in PR
* Reformatted file to get rid of unnecessary whitespace characters

Author: hiranya911

.gitignore

@@ -0,0 +1,5 @@
+*.pyc
+.python-version
+.cache/
+.tox/
+*.egg-info/