Add "tox.ini" and get tests running vs 2.6, 2.7

.gitignore

@@ -1,8 +1,6 @@
+/.tox/
+/MANIFEST
 *.py[co]
-*.egg-info
-*~
-*.bak
-build/
-src/ephem/_libastro.so
-src/ephem/doc/_build
-tmp*.py
+/src/ephem/_libastro.so
+/src/ephem/doc/_build
+/tmp*.py

src/ephem/tests/test_angles.py

@@ -1,12 +1,11 @@
 #!/usr/bin/env python
 
 import unittest
-import math
 from ephem import Angle, degrees, hours
 
 # Determine whether angles work reasonably.
 
-arcsecond = 2. * math.pi / 360. / 60. / 60.
+arcsecond_places = 5
 
 class AngleTests(unittest.TestCase):
     def setUp(self):
@@ -17,14 +16,16 @@ def test_Angle_constructor(self):
         self.assertRaises(TypeError, Angle, 1.1)
 
     def test_degrees_constructor(self):
-        self.assertAlmostEqual(self.d, degrees('85:56:37'), delta=arcsecond)
+        self.assertAlmostEqual(self.d, degrees('85:56:37'),
+                               places=arcsecond_places)
     def test_degrees_float_value(self):
         self.assertAlmostEqual(self.d, 1.5)
     def test_degrees_string_value(self):
         self.assertEqual(str(self.d), '85:56:37.2')
 
     def test_hours_constructor(self):
-        self.assertAlmostEqual(self.h, hours('6:06:41.6'), delta=arcsecond)
+        self.assertAlmostEqual(self.h, hours('6:06:41.6'),
+                               places=arcsecond_places)
     def test_hours_float_value(self):
         self.assertAlmostEqual(self.h, 1.6)
     def test_hours_string_value(self):

src/ephem/tests/test_rst.py

@@ -3,6 +3,7 @@
 import doctest
 import unittest
 import os.path
+import sys
 import time
 from glob import glob
 
@@ -12,9 +13,17 @@ def load_tests(loader, tests, pattern):
     os.environ['TZ'] = 'EST+05EDT,M4.1.0,M10.5.0'
     time.tzset()
 
-    return unittest.TestSuite([
+    # The different floating-point formatting rules in 2.6 and prior
+    # ruin our doctests.
+
+    tests = []
+
+    if sys.version_info >= (2, 7):
+        tests.extend([
             doctest.DocFileSuite('../doc/%s' % os.path.basename(path))
             for path in glob(os.path.dirname(__file__) + '/../doc/*.rst')
             if os.path.split(path)[-1] != 'index.rst'
             # skips time-dependent doctest in index.rst
             ])
+
+    return unittest.TestSuite(tests)

tox.ini

@@ -0,0 +1,8 @@
+[tox]
+envlist = py26, py27
+[testenv]
+commands = python -m unittest discover ephem
+[testenv:py26]
+deps =
+    unittest2
+commands = unit2 discover ephem