Print versions of software used in Travis output

.travis.yml

@@ -61,6 +61,9 @@ before_install:
     - python check_bento_build.py
 
 install:
+    - tools/header.py "Dependency versions"
+    - tools/build_versions.py
+
     - python setup.py build_ext --inplace
 
 script:

tools/build_versions.py

@@ -0,0 +1,12 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+
+import numpy as np
+import scipy as sp
+import matplotlib as mpl
+import six
+
+for m in (np, sp, mpl, six):
+    print(m.__name__.rjust(10), ' ', m.__version__)
+

tools/heading.py

@@ -0,0 +1,14 @@
+#!/usr/bin/env python
+
+from __future__ import print_function
+import sys
+
+screen_width = 50
+
+print('*' * screen_width)
+
+if len(sys.argv) > 1:
+    header = ' '.join(sys.argv[1:])
+    print('*', header.center(screen_width - 4), '*')
+    print('*' * screen_width)
+