Bumping node version

v1.0.4

chore(nvmrc): bump node version to latest stable (#27)

v1.0.3

Fixes a bug where a custom font file was not being used if a css font was also included, even though the font name referenced it.

v1.0.2 Support for custom font files

Add support for fontFileUrl (#23)

* Add support for fontFileUrl

* Pull out fontEmbed function and test

v1.0.1: fix(font): custom font css applies correctly

Custom font css was not being applied to the button unless the font
already existed in your local font directory. Fonts from the CSS file
were not loaded.

Fix is to use svg2png which renders the svg buffer in PhantomJS and
pulls an image from there.

Also removed some extrenuous methods that cuased issues when applying
fix and were not being used anywhere.

Closes https://usabilla.atlassian.net/browse/FOO-63

Initial release

Merge pull request #14 from usabilla/buffer-return

Return buffer for the publisher