Add really rough draft of release instructions.

Still need to clean up and format in markdown.
Some formatting fixes I want to check are working
Finish markdown formatting
Minor fixes for clarity, correct spelling, and formatting
Mention good links to include with release announcement
Address comments from @ElDeveloper and @gregcaporaso
admins -> managers
Merge branch 'master' into release-instructions

Conflicts:
	MANIFEST.in
Add changelog mention
And the award for the world's most annoying comment goes to...

@ElDeveloper!
Merge pull request #452 from ElBrogrammer/release-instructions

Add release instructions