LibreSSL 2.0 (new formula)

Add a formula for the first portable release of LibreSSL, OpenBSD's
fork of OpenSSL.
Remove "without-check" option

Always run "make check" after compilation.
Fix default configuration file directory

Set configuration file location to /usr/local/etc/libressl
Use mkdir_p instead of mkdir
LibreSSL 2.0.1

Update to latest portable release, use newly supported openssldir and
enginesdir configure arguments instead of inreplace, add mirror, and
use official sha256 hash.
Add HEAD link

Add option for git master version with dependencies on autotools.
libressl: add 2.0.1 bottle.