Removes check for IP:port availability if using replace_address.

Normally you want ccm to warn you that an IP:port is already in use,
however if you are using replace_address it's assumed you know what
you're doing. If the IP:port is in use, you'll see a C* error rather
than a ccm error.
Merge pull request #95 from EnigmaCurry/replace_address_fixes

Removes check for IP:port availability if using replace_address.
Turns JNA off by default.
Moves flush directory to the local node's path.
Only sets flush directory on 2.1+
Merge pull request #98 from EnigmaCurry/jna_fix

Turns JNA off by default.
Merge pull request #99 from EnigmaCurry/flush_dir

Moves flush directory to the local node's path.
Clear flush dir for 2.1+ clusters
Merge pull request #101 from thobbs/clear-flush-dir

Clear flush dir for 2.1+ clusters
initial support for windows.  cygwin and command-prompt
Merge pull request #102 from josh-mckenzie/windows-support

initial support for windows.  cygwin and command-prompt
Makes cqlsh use native protocol port on 2.1+