title: Bokeh DataTables overlapping in both Row and Gridplot
body: <p>I want to display two DataTables in one row, but when I do so, the two DataTables are not spaced apart and overlap.  Does anyone know how I can prevent this?  </p>
  
  <p>In the example code below two datatables are created; however, you cannot read the value column of table1 because table2 is directly on top of it.</p>
  
  <pre><code>x = [1,2,3]
  y1 = np.random.randn(3)
  y2 = np.random.randn(3)
  
  def create_data_table(x,y):
      source = ColumnDataSource(data=dict())
      source.data = {'index': x, 'value':y}
      columns = [TableColumn(field="index", title="index"),TableColumn(field="value", title="value")]
      data_table = DataTable(source=source, columns=columns)
      table = widgetbox(data_table)
      return table
  table1 = create_data_table(x,y1)
  table2 = create_data_table(x,y2)
  show(row(table1,table2))
  </code></pre>
  
  <p><img src="https://cloud.githubusercontent.com/assets/7672771/24115091/7b8e484e-0d5f-11e7-9aaa-8ddeba02b13a.png" alt="screen shot 2017-03-20 at 11 22 04 am"></p>
  
  <h2>--------------------------------------------  <strong>EDIT</strong>  ---------------------------------------------------</h2>
  
  <p>The above example does not have enough columns/data to fully illestrate the problem.  Here is an example that does:</p>
  
  <pre><code>from bokeh.models import ColumnDataSource,TableColumn,DataTable
  from bokeh.layouts import widgetbox,row
  from bokeh.io import show
  import random
  x = [1,2,3]
  def random_list():
      return [round(random.random(),3) for i in range(3)]
  
  def create_data_table(x):
      source = ColumnDataSource(data=dict())
      source.data = {'index': x, 'value':random_list()}
      width=60
      columns = [TableColumn(field="index", title="index", width=width),
                 TableColumn(field="value", title="value", width=width)]
      for i in range(4):
          source.data[str(i)] = random_list()
          columns.append(TableColumn(field=str(i), title=str(i), width=width))
      data_table = DataTable(source=source, columns=columns, width=width*6,row_headers=None)
      table = widgetbox(data_table)
      return table
  table1 = create_data_table(x)
  table2 = create_data_table(x)
  show(row(table1,table2))
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/23ngp.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/23ngp.png" alt="enter image description here"></a></p>