Revised changelog to reflect changes since r105.

Included below is a summary of changes committed in the merge of
the wrappers branch (r177):

Refactored wrappers, with the following aims:

+ New command line convention, as follows:
 1st form: input files specified
    <wrapper> [wrapper_arg...] input_files... [pandoc_option...]
 2nd form: using STDIN, no input file is specified
        <wrapper> [wrapper_arg...] -- [pandoc_option...]
 3rd form: input files specified, optional --
    <wrapper> [wrapper_arg...] input_files... -- [pandoc_option...]

  - All wrappers except 'html2markdown' and 'latex2markdown' should
    accept multiple filenames.
  - Use getopts shell builtin for portable option parsing.

+ Remove code duplication and provide consistency across
  command line interface.

+ Allow white space in filenames, especially suitable for Mac OSX users

+ Improve html2markdown's web grabber code, making it more robust,
  configurable and verbose.

  - new function 'grab_url_with' as the wrapper to web grabbers.
  - 'grab_url_with' can report errors if the grabber fails.
  - new command line option 'n' to avoid automatic web grabbing.
  - new command line option 'g' which explicitly selects a grabber and 
    optionally specifies new options for the selected grabber.  Possible 
    use cases:
        # Just use curl.
        html2markdown -g 'curl'

        # Use wget by setting timeout to 10 seconds and limit retries to 2.
        html2markdown -g 'wget --timeout=10 --tries=2'

+ Add code to html2markdown that tries to determine the character 
  encoding of an HTML file, by parsing the "Content-type" meta tag.

  - if the encoding can't be determined, then if the content is local,
    the local encoding is used; if it comes from a URL, UTF-8 is used 
    by default.
  - if input is from stdin, don't try to determine character
    encoding.
  - add a new option '-e' to specify encoding.

+ Better warning messages:

  - print warning if iconv not available
  - in markdown2latex, print only relevant parts of log when pdflatex
    returns an error condition
  - in markdown2latex, when 'ucs.sty' is not found, print message
    telling where to find the 'unicode' package.

+ Remove PANDOC_OPTS environment variable functionality.  It is
  no longer necessary, now that pandoc options may be specified on
  the command line.

+ Add tests for wrappers' processing of command line arguments:

  - new file 'testwrapper.in' to test the parsing code under 'bash',
    'dash', 'ksh' and 'zsh' in POSIX mode.
  - new makefile target 'test-wrappers' to run 'testwrapper'

+ Document changes in revisions to wrapper syntax in README and man pages.



git-svn-id: https://pandoc.googlecode.com/svn/trunk@178 788f1e2b-df1e-0410-8736-df70ead52e1b

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