Switch to side-by-side view

--- a
+++ b/src/examples/plot_coverage.py
@@ -0,0 +1,33 @@
+from pkg_resources import resource_filename
+
+from janggu.data import Cover
+from janggu.data import HeatTrack
+from janggu.data import LineTrack
+from janggu.data import plotGenomeTrack
+
+roi = resource_filename('janggu',
+                        'resources/sample.bed')
+
+bw_file = resource_filename('janggu',
+                            'resources/sample.bw')
+
+cover = Cover.create_from_bigwig('coverage1',
+                                 bigwigfiles=[bw_file] * 2,
+                                 conditions=['rep1', 'rep2'],
+                                 roi=roi,
+                                 binsize=200,
+                                 stepsize=200,
+                                 resolution=50)
+
+cover2 = Cover.create_from_bigwig('coverage2',
+                                  bigwigfiles=bw_file,
+                                  roi=roi,
+                                  binsize=200,
+                                  stepsize=200,
+                                  resolution=50)
+
+plotGenomeTrack([cover, cover2],
+                'chr1', 16000, 18000).savefig('coverage.png')
+
+plotGenomeTrack([HeatTrack(cover), LineTrack(cover2)],
+                'chr1', 16000, 18000).savefig('coverage2.png')