Support (inline) bedlike data

[manzt]

Bed-like data
-------------

If you have data representing intervals in a Python object, you can load it
directly into higlass using the `bedtiles` helper function:

.. image:: img/beditems.png

.. code-block:: python

	from higlass.client import View, Track
	from higlass.inline_tiles import bedtiles
	import higlass

	bed = [['chr1', 1000, 2000, 'item #1', '.', '+'],
	       ['chr2', 3000, 3500, 'item #1', '.', '-']]

	chroms = [['chr1', 2100], ['chr2', 4000]]


	data = bedtiles(bed, chroms)
	track = Track(track_type='bedlike', position='top',
	              height=50, data=data, options={"minusStrandColor": "red"})


	d,s,v = higlass.display([[track]])
	d


Note that this function loads all the data into the viewconf and does
not use a server. Do not use this function with more than ~3000 items of
data.

We haven't implemented an inline-tiles function, however this API should be easy to support.