title: Fix x_axis and fill under curve Bokeh
body: <p>I am trying to configure my Bokeh plots in Python such that they look a bit nicer. For example, is there a way to fix the maximum zoom out? Such that Bokeh cannot zoom out more than what is specified by the x-axis? E.g. look at <a href="http://docs.bokeh.org/en/latest/docs/user_guide/quickstart.html#datetime-axes" rel="nofollow noreferrer">bokeh example</a>, and especially "Datetime axes". I would like to fix the axis size so that you cannot zoom out more than the initial x axis is wide. </p>
  
  <p>Another question; is there a way to fill an area under a curve in a specified color? Like in the figure <a href="https://www.avanza.se/index/om-indexet.html/19000/usd-sek" rel="nofollow noreferrer">USDSEK</a>. I can provide code, but I don't think it's necessary for the problem at hand. </p>