Data fetcher

[David Karlsson]

A generic fetcher mechanism (class with subclasses probably) that is able to do the following: * fetch a webpage and parse line/char + size to a signal * fetch a webpage and regexp parse a certain line to a signal * fetch a xmlpage over http and get content of a certain tag (xpath) to a signal * fetch a json message over http and get a portion of the content to a signal * run a bashscript and get a portion of the result to a signal

[David Karlsson]

Missing functionality at this moment is fetch from executed command and JSON result handling.