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Summary:
Follow the instructions in the TeX book for drawing \overlines. This uses the
same code as fractions to produce the bars. Also added the ability to cramp
styles (i.e. T -> T' and T' -> T').
Test Plan:
- Look at `\overline{x}`, `\overline{\dfrac{x}{y}+z}`, and
`\blue{\overline{x}}` to make sure they look good.
- Make sure the tests work
- Make sure the huxley tests look good (Not here yet :( )
Reviewers: alpert
Reviewed By: alpert
Differential Revision: http://phabricator.khanacademy.org/D11604
