Revamp buggy Align component

[ry5n]

Remove unsupported Align component features, support horizontal alignments and update code style. Incorporates the changes in #54. This makes the component pretty small; we should consider deprecating it in favour of direct use of flexbox.

Status: Ready to merge

Reviewers: @kpeatt @jeffkamo Ticket: Fixes #45

Changes

• Remove the ability to individually align child items due to poor support for align-selft. In fact, the c-align__item sub-component is completely removed in favour of alignment modifiers on the parent.
• Add root-level modifiers for top, bottom, left and right alignment of child items.

  How to test-drive this PR

• Check out the new tests.

[kpeatt]

@ry5n I think lots of these components have really simple direct uses but the idea is to avoid rewriting stuff often. This looks good to me.

[ry5n]

OK, cool. @kpeatt @jeffkamo can one of you check the tests for this and merge if it all checks out?

[kpeatt]

@ry5n Might get a chance to poke at this today otherwise it's my first priority on Monday.