Cleaning up README.
Issue #407 - Added Loader, issues list
Issue #359 - clean and rename Makefile command
Merge pull request #488 from webcompat/makefile

Clean and rename Makefile command
Fixes #485 - Only serialize params once.

This bug was only exposed by clicking on an issue label. This patch
includes tests for that specific use case as well.
Merge pull request #489 from webcompat/issues/485/1

Fixes #485 - Only serialize params once.
1.3.1 changelog.
Add some comments for clarification on label search test.
Merge pull request #487 from webcompat/loading-indicator

Added Loader, issues list
Merge pull request #476 from webcompat/readme-edits

Cleaning up README.
Issue #479 - Add ability to pass existing params to get_search_results
Issue #479 - Remove unused re module.
Issue #479 - Normalize from Issues to Search API params