Add wikitext_wrapper executable
Add wikitext_wrapper executable

As mentioned in commit 4488c7b, in the library files we trust either the
packaging system (usually RubyGems) or the user to correctly set up the
LOAD_PATH so that all files will be found when included using simple
relative paths like "wikitext/version" and so on.

The specs and benchmarking scripts already explcitly set the LOAD_PATH
and use absolute paths where appropriate to ensure that the local
version is tested rather than some other version that might be installed
elsewhere on the system.

This commit addresses the last missing piece of the puzzle, the
"bin/wikitext" executable. That was also changed to trust the LOAD_PATH
and use shorter relative paths, and this will work for the installed
case because the packaging system (RubyGems) will actually set up a
wrapper in the user's PATH which sets up the LOAD_PATH appropraitely.

In local testing however, no such wrapper script is in place so trying
to run "bin/wikitext" will either fail (when no version is installed on
the system in th PATH) or will most likely use the wrong version (when
another version is found elsewhere).

So, for the purposes of local testing we here add a wrapper script that
achieves the same affect as the wrapper created by RubyGems during
installation: we set up a local LOAD_PATH and then fire off the real
executable.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

wincent/wikitext,barnaclebarnes/wikitext,barnaclebarnes/wikitext,barnaclebarnes/wikitext,wincent/wikitext,geni/wikitext,geni/wikitext,geni/wikitext