Change content-l approach to handle three separate content layouts:
full, main, and sidebar.
Move content-l_col modifiers and dividers into mixins
to allow reuse in content-l modifier classes.
Display .content-l_col-RATIOs as columns above 600px by default.
Use breakpoint vars.
Re-add .content-l_col-1 class
Update documentation with content-l_col-1
Fix content-l__full display of eighths cols
Update bower.json & changelog with new version info. Fix content-l__sidebar media query.
Fix version number
Merge pull request #4 from virginiacc/gh-pages

Adapt content-l to full, main, and sidebar containers