Add `make test` target to Makefile
Use travis-ci
Boo! typo in travis file
yaml_parser_scan_tag_uri: fix int overflow leading to buffer overflow
yaml_stack_extend: guard against integer overflow
yaml_parser-{un,}roll-indent: fix int overflow in column argument
Sync to head of https://bitbucket.org/xi/libyaml
Fix for https://bitbucket.org/xi/libyaml/issue/10/

https://bitbucket.org/xi/libyaml/issue/10/wrapped-strings-cause-assert-failure

Commenting out the assert makes the scanner do the right thing and
results in just a simple parse failure.
Add a development directory.

This directory contains instructions and code for getting a libyaml
development environment running.
spec-1.2 rule [53]

Support "\/" for JSON compatability.
This broke perl tests and is supposedly not needed.