'Generates a Pynliner object from the given HTML string.
Returns self.
>>> p = Pynliner()
>>> p.from_string(\'<style>h1 { color:#ffcc00; }</style><h1>Hello World!</h1>\')
<Pynliner object at 0x26ac70>'

def from_string(self, string):

    self.source_string = string
    return self
