Fix README.md
Merge pull request #34 from rowoot/fix-readme

Fix README.md
ADD first draft of Sass chapter
ADD grunt template engine example
fix merge conflicts
add grunt/sass entry to global ToC
typo correction on grunt/getting-started
Merge pull request #36 from joaostein/typo-fix

typo correction on grunt/getting-started
Merge pull request #35 from belen-albeza/master

Sass chapter for Grunt