Use px instead of rem to support ie8
use @gutter-size-ie to support ie8
add semicolon to end of statements.
code will not be wrapped in #example-code
Fix stack overflows in ie8

propertychange event was continually firing because the text area was being altered by loading a new example.  so instead only watch for keyup events.
Only use ie fallback if we need to
Merge pull request #636 from mfairchild365/examples-ie8

Fix Examples in ie8