Initial work on PSR Workflow bylaw

Taken from [my gist](https://gist.github.com/philsturgeon/9a066a7f009f61dc0e9f).
Removed some prose from the intro
Update 004-psr-workflow.md
Improved line breaks
Draft is now when it goes into proposed
Added example meta doc
Added note saying draft is when meta doc happens
Added a line about moving sponsors to contributors
Added chosen and alternative approaches
Added pros/cons
More strict on the name of the meta doc
Improved the workflow document
Improved sponsor participation explanation
Merge pull request #2 from bschussek/workflow-bylaw

WIP Improvements
Changes to pre-draft progression
Improved the description of the stages
clarifications
Merge pull request #3 from bschussek/workflow-bylaw

Improved the description of the stages
Removed RFC uppercase words

This was initially a good idea but ended up sounding like a petulant child in charge of a jungle gym instead of a useful document. This wording doesn't apply to human interaction and should be left to PSRs instead.
added a clarifying comment about comments vs. meta docs