Fix SWF position and size calculations in IE<9.

Fixes #190.
Closes #191.

In oldIE, using the `typeof` operator on native DOM methods like `getBoundingClientRect` actually returns "object" instead of "function".
Also, `getBoundingClientRect` did not add the "height" and "width" properties to TextRectangles until IE9, so calculate those manually if need be.

Bumped version to v1.2.0-beta.3.