Version 1.2.1 (October 14, 2014)

Performance optimizations:

- Sped-up calculateDiff() with linked region borders array instead of
  cycling through tokens
  - New option $wgWikEdDiffRepeatedDiff to turn off repeated diff
    refinement
    - Freed memory by undefining arrays
    - Optimized 'for' loops by precalculating termination values

    Bug fixes:

    - Fixed space highlighting breaking diff html
    - Fixed 'sentence' split regExp
    - Fixed sliding regExps
    - Removed double container from 'No change' message
    - Added UniCode support to clipDiffFragments() calculations

    Various:

    - Updated hook and hook handler to 'GenerateTextDiffBody'
    - Fragment container from <div> to <pre> for newline copying
    - Changed all comparison operators to strict
    - Added new regExp 'blankOnlyToken' for testing unique tokens
    - Removed HTML debug log
    - Made JavaScript highlight handler compatibel with wikEd diff
      JavaScript library

Change-Id: I4870272734ae2a01b3c5da77147c79027dc98815