Updates autoprefixer via grunt-myth update

Removes display flex from columns

Updating dist

Fixes custom media issue. Adds container and container-fluid

Replaces grid with container and container-fluid

5.0.0

Updating API to match bootstrap grid. Fixes 16 Fixes 14

Fixes kristoferjoseph#6 by adding back long decimals for IE10+

Updating class names and removing gutters

Updating api to add responsive modifiers to alignment, distribution, …

…and reordering.