Wrote a README file with bootstrapping information.

README.bootstrap:
    As above.
Update INSTALL_CVS/INSTALL.git

INSTALL_CVS:
INSTALL.git:
    Corrected the out-of-date references to CVS.

    Renamed INSTALL_GIT to INSTALL.git
Don't use -j with the 'depend' make target.

INSTALL.git:
    As above.
Make some minor edits to README.bootstrap.

README.bootstrap:
    Correct some oversimplifications.  (eg: asm_fast.gc won't work on OS X).

    Adjust some prose to make it clearer.