Avoid line breaks at markdown math equations

[ArmageddonKnight]

Thanks for the great extension. It really helps me a lot when formatting my code.

Since GitHub markdown now has support for Math equations, it might be better if we could potentially avoid inserting line breaks inside math equations in MarkDown files, becuase those would prevent GitHub from rendering the math equations properly.

As an example, consider the following text:

• Lorem Ipsum is simply dummy text of the printing and typesetting industry. $a = b + c$
  

  Lorem Ipsum is simply dummy text of the printing and typesetting industry. $a = b + c$

• Rewrap would reformat it to

  Lorem Ipsum is simply dummy text of the printing and typesetting industry. $a =
  b + c$
  

  Lorem Ipsum is simply dummy text of the printing and typesetting industry. $a = b + c$

  and hence not rendering the math equations properly.

The issue

• #69

might be related.

Thanks again.