Make scripts into symlinks

pip can't handle zip files with symlinks.  Attempt to workaround that by
transforming the bin scripts into symlinks after the zip file has been
unarchived into the build tree.

setup.py

@@ -1,4 +1,5 @@
 import os
+import os.path
 import sys
 
 sys.path.insert(0, os.path.abspath('lib'))
@@ -18,6 +19,25 @@
                 "That indicates this copy of the source code is incomplete.")
         sys.exit(2)
 
+SYMLINKS = {'ansible': frozenset(('ansible-console',
+                                  'ansible-doc',
+                                  'ansible-galaxy',
+                                  'ansible-playbook',
+                                  'ansible-pull',
+                                  'ansible-vault'))}
+
+for source in SYMLINKS:
+    for dest in SYMLINKS[source]:
+        dest_path = os.path.join('bin', dest)
+        if not os.path.islink(dest_path):
+            try:
+                os.unlink(dest_path)
+            except OSError as e:
+                if e.errno == 2:
+                    # File does not exist which is all we wanted
+                    pass
+            os.symlink(source, dest_path)
+
 setup(
     name='ansible',
     version=__version__,