Add detection for IE Compatibility View

This adds the method ie_compat_mode to use to determine if the
browser is IE in the compatibility view mode.

This also removes an invalid IE UA string from the tests and fixes
another UA string that was also invalid, both from commit 3c727f5.
Merge pull request #75 from dougwilson/feature/ie_compat_mode

Add detection for IE Compatibility View
Fixes older dates in Changes.

Also bumps version to 1.66.
v1.66

    - Adds detection for IE Compatibility View (Douglas Christopher Wilson)