Minor grammar fix.

Fixed a grocer's apostrophe in the Readme.
Use Clang and GCC on Travis
dont run todo with basic test line
only run the build tests on travis
Add test stuff into Makefile.am
Forgot to add these tasks
Merge pull request #209 from jbussdieker/master

Add test stuff into Makefile.am
Fix dependency
Remove unnecessary target
Fix travis.sh script
Merge pull request #210 from jbussdieker/master

Fix dependency
Update Readme.md
Update Readme.md
Merge pull request #206 from nschonni/patch-1

Use Clang and GCC on Travis
merge!
Merge branch 'master' of github.com:hcatlin/libsass
Merge branch 'master' into extend