Fix text utils for vertical text.

Close #504.
Check computed style for svg.
Change sequence.
Put test earlier.
Fix test message.
Add more info.
Check single character.
Fix test.
Merge branch 'develop' into 504_vertical_labels

Conflicts:
	plottable.js
	src/utils/textUtils.ts
Merge pull request #1226 from palantir/504_vertical_labels

Fix text utils for vertical text.