Move test harnesses under test

Adjusted include paths
sourcemaps: Fix line number calculation.

Fixes issue #264
handling the backslash folder-separator in case we're on Windows
improving the Windows folder-separator handling
nuther tweak to the Windows path handling
fixing an edge case with attribute selector parsing
fixing an edge case when parsing the arguments of pseudo-selectors
whoops, don't need that case
Merge pull request #275 from svnieuw/sourcemaps-fix-linebreaks

sourcemaps: Fix line number calculation.
Merge pull request #272 from nschonni/move-test-harness

Move test harnesses under test
commenting out this unfinished stuff
Merge github.com:hcatlin/libsass