Initial jsv object

When you create your own JSV, import the jsv and subclass your jsv object to the master. override the jsv_on_verify and/or the jsv_on_start functions. This doesn't handle env yet, but everything else I've tested seems to work. Should work in both python2 and python3

from JSV import JSV
class MyJSV(JSV):
  def jsv_on_verify(self):
    self.jsv_accept("")