Patch for the implementation "index" option to configure the index file name while serving static files

[Javier Manteiga]

 This is a patch for the implementation of the "index" option to configure the index file name while serving static files. It allows to add a new option "index" to the configuration of the "share" action, so the file to be served can be configured instead of being harcoded. It supports to define the index value using arrays or variables as in the example:

"action": {                "share": "/www/data/static/",                "index": [ "index.htm", "$host" ]            }
Kind Regards.  
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