Feat/tooltip height

[anthonyjdella]

This addresses Issue #69.

Changes:

1. Modify data-microtip-size attribute to account for height & width.
2. Add data-microtip-width attribute to specify tooltip width.
3. Add data-microtip-height attribute to specify tooltip height.
4. All the above points have included line-height: 150%; to make multiple line text easier to read.

Screenshot examples: height: 80px; height: 150px; height: 260px;

What this looks like without this feature: