Simple autogen script
Make test stuff to automake template so it doesn't get overwritten.
Merge pull request #149 from jbussdieker/master

Add autogen.sh and make sure test stuff is in automake template
Set default values for sassc and sass-spec.
Enable autotools compilation on Travis.
Add --skip on Travis.

For personal development, it's good to stop on the first error, but for
CI, it's better to see the overall pass-fail rate.
Set up testing with autotools.
Enable autotools testing on Travis.
Remove -d for specifying spec directory.
Use automake's test driver.
Enable verbose output on Travis with automake.
Fix --skip in Travis with default Makefile.
Fix automake tests when sass-spec-dir is absolute.

It seems that automake gets confused with an absolute test path, even if
that path is contained in this directory. It doesn't seem to care if the
directory is outside the source directory, so we just make the absolute
paths relative. Not so easy in sh, but fortunately, we already require
ruby in this region of configure.