title: how to show integer, not float, with hover tooltip in bokeh
body: <p>I have a simple graph of X-Y data points.  I want my Bokeh figure to show me the integer value of each datapoint when I hover over it.  I am close to getting what I want but when I hover over the data point, it shows a float and then higher up, it uses scientific notation.  Is there a way to have the hover tool only return the integer values of X and Y and not use scientific notation? </p>
  
  <p>Here is some example code:</p>
  
  <pre><code>from bokeh.plotting import *
  from bokeh.models import HoverTool
  
  x = range(1,101)
  y = [i*i for i in x]
  
  TOOLS = "pan,wheel_zoom,box_zoom,reset,save,box_select, hover"
  
  p = figure(x_axis_label = "Days",
         y_axis_label = "Return",
         tools=TOOLS)
  p.circle(x, y)
  
  #adjust what information you get when you hover over it
  hover = p.select(dict(type=HoverTool))
  hover.tooltips = [
      ("Days", "$x"),
      ("Return", "$y"),
  ]
  
  show(VBox(p))
  </code></pre>