removed forceHTTP from math fb and maps

On modern browsers, running javascript from external sources without using SSL while viewing a page using SSL, the external source is blocked. This causes some of the MDwiki gimmicks (specifically the math, facebook like, and google maps) to not work.  Switching the external sources to allow SSL fixes this issue.

Since the facebooklike and math gimmicks both run javascript from external sources, I've removed the part of those gimmicks that forces the use of plain text connections. I did not force SSL but rather left it for prepareLink to decide which to use (by default it uses SSL when the MDwiki instance uses SSL).