Fixed readme links, changelog, and roadmap for 2.1.0 release.
Updated 2.1.0 changelog in README

Changelog for 2.1.0 now includes notes about code coverage and PEP8 compliance.
Also fixed formatting and markdown syntax to accomodate md parsing rules in most
syntax highlighters (which breakdown when "```" is used inline)
Merge branch 'documentation/readme/2.1.0-changelog' into dev