Merge README.md

Merge the 2 pages to only have one place with all the information (and clearer!)
Provide only one README.md
Update to point to releases page
change-history.md is no more needed
correct typo
Attempt #1 at a more sane use of workspaces.
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Make sure cleanup happens before GC starts throwing everything away.
Memoize it.
Explicitly clean up the things.
Stop making things up!
Merge pull request #414 from git-tfs/hire-a-janitor

Create and clean up workspaces only once per git-tfs run. Closes #315. Closes #405.
Disable git's pager.
Merge pull request #397 from pmiossec/refactoring_doc

Merge README.md
Merge pull request #416 from spraints/disable-pager

Disable git's pager.
Also update the README.
v0.18.0
Update Releasing.md
Update README.md
Fix command switch.