Switch travis email notifications back to the default.

Emails now go to author (+comitter).

 .travis.yml                  | 14 ++++----------
 build-support/bin/ci-sync.sh |  5 +++--
 2 files changed, 7 insertions(+), 12 deletions(-)

Testing Done:
$ travis lint
Hooray, .travis.yml looks valid :)

And CI went green here: https://travis-ci.org/pantsbuild/pants/builds/38073663

I enabled ci for my pantsbuild/pants fork and I added a commit of this:
```console
$ cat << EOF > build-support/bin/ci.sh
#!/usr/bin/env bash
exit 1
EOF
```
That CI went red and emailed just me for both the pantsbuild/pants and jsirois/pants jobs:
  https://travis-ci.org/jsirois/pants/builds/38087136

Email to just me:
 jsirois / pants (jsirois/travis/email_simple)

Build #4 is still failing.	 38 seconds
	John Sirois	f727f99 Changeset →
 	Small workding fixes.

Bugs closed: 682

Reviewed at https://rbcommons.com/s/twitter/r/1169/