Adjust positions of extenders for double-lined vertical arrows.  (The horizontal position of the extender is off in teh fonts.)  Resolves issue #476.
Fix string character reference to work with IE7.  Resolves issue #624.
Changed regular expresion to account for new (longer) Rackspace address.  Resolves issue #709.
Make empty rows be the standard height and depth; indeed make ALL rows
have at least this height and depth.  Resolves both problems in issue #719.
Merge branch 'issue476' into develop.  Issue #476.
Merge branch 'issue624' into develop.  Issue #624.
Merge branch 'issue709' into develop.  Issue #709.
Merge branch 'issue719' into develop.  Issue #719.