add: linkify travisci badge
add a way to get a new 'attrs' attribute into the template
convert short_description to a title attr and add class
make sure 'href' isn't allowed to be set
make sure custom attrs are partitioned off
1am coding does this
update to disallow custom title attr
add: incorporate custom attrs into the template
make sure it renders attrs escaped
add documentation of .attrs attr
Merge pull request #13 from texastribune/attrs-everywhere

Add ability to set arbitrary attributes on the buttons