yamll: yaml linter
Run this over YAML files to determine if they are well-formed or not.
Usage: yamll [-hq] files...
For each file, yamll will make sure it is a well-formatted YAML
file. Unless the -q option is passed, yamll will print the names
of each file and whether it was well-formed. With the -q option,
only malformed files are printed.
If the only command line argument is "-", yamll will read from
standard input. It is assumed the entirety of standard input is
a single file.