Fix errors in called function names.
Builds on Windows now, but can't find .SO

Just want to commit before something blows up again D: Need to remove
some of the stuff changed by this commit later, as it may not be
necessary.
Ignore binary files from extension compilation
Remove unnecessary "sh" calls in Rakefile.
Clean up extconf. Should work on Linux and Windows.
Take out PATH modification. Doesn't seem to fix it.