Added padding to columns

Signed-off-by: Martin Evans <martindevans@gmail.com>
Added titles to column elbows for left and right columns.

Signed-off-by: Martin Evans <martindevans@gmail.com>
Adjuested markup to allow buttons to be highlighted correctly when clicked
Disabled the user from being able to select text in the buttons
changed selector for groups to correctly work with nested lists. Now requires that all items in a group have class lcars-group-member.
See #22 for one unresolved issue

Signed-off-by: Martin Evans <martindevans@gmail.com>
Merge branch 'bugfix/menu-button-list' of github.com:martindevans/LCARS into bugfix/menu-button-list
Changed text in elbow descendents to be capitalized (every first letter of each word is in caps)

Signed-off-by: Martin Evans <martindevans@gmail.com>
Merge branch 'bugfix/menu-button-list' into feature/elbow-content
Changed column padding to be margins

Signed-off-by: Martin Evans <martindevans@gmail.com>
Fixed color precedence bug (resolve #22)

Signed-off-by: Martin Evans <martindevans@gmail.com>
Merge pull request #23 from martindevans/feature/elbow-content

Feature/elbow content