Sets up travis.yml to autobuild zip release of sendgrid-php
Also remove extra directories that are cruft to the user
Fix \n. Use printf

And php of course
Builds and saves versions into a package on S3 for download
Only upload main if in master branch
Update README
killing @scottmotte's favorite echo - @nquinlan
allowing composer

without this the library doesn't load
Merge pull request #77 from sendgrid/sm-build

added automatic building by travis