Update to 2.0008

Upstream changes:
2.0008 2013-07-06 00:09:43-0700
    [BUG FIXES]
    - Fix a chache issue that UTF8 flags were not turned on
      as expected (#82)
    - Fix Metakolon doc (#83)

2.0007 2013-06-21 13:16:16-0700
    [DOCUMENTS]
    - Add doc about chomping newlines (<:- ... -:>)

    [NEW FEATURES]
    - Add pre_process_handler to pre-process template content (bluescreen)

2.0006 2013-06-02 22:58:27
    [BUG FIXES]
    - Fix an issue that the state of VM broke on exception
      reported by nihen

2.0005 2013-06-02 12:23:15
    [BUG FIXES]
    - Fix a Multiplexed WRAPPER issue reportedy by @kawamuray (#79)
      Those who use WRAPPER, template cascading, or anonymous functions
      (lambdas) are strongly recommended to upgrade Xslate.

2.0004 2013-05-29 20:27:07
    [TEST FIXES]
    - Template string must be bytes (#78)

2.0003 2013-05-10 12:59:11
    [BUG FIXES]
    - Fix a crash on compiling templates (#77)

2.0002 2013-04-26 12:51:47
    [BUG FIXES]
    - Support perl-blead (5.17.11)

(wen)