Universal pathmagic returns app dir; activated in setup for python3

setup.py

@@ -48,6 +48,9 @@ class InstallCmd(install):
 
 def unittest_discover():
     """Explicit test suite creation"""
+    if sys.hexversion >= 0x3000000:
+        from pybitmessage import pathmagic
+        pathmagic.setup()
     return unittest.TestLoader().discover('pybitmessage.tests')
 
 

src/bitmessagemain.py

@@ -12,10 +12,11 @@ The PyBitmessage startup script
 import os
 import sys
 
-app_dir = os.path.dirname(os.path.abspath(__file__))
-os.chdir(app_dir)
-sys.path.insert(0, app_dir)
-
+try:
+    import pathmagic
+except ImportError:
+    from pybitmessage import pathmagic
+app_dir = pathmagic.setup()
 
 import depends
 depends.check_dependencies()

src/pathmagic.py

@@ -0,0 +1,10 @@
+import os
+import sys
+
+
+def setup():
+    """Add path to this file to sys.path"""
+    app_dir = os.path.dirname(os.path.abspath(__file__))
+    os.chdir(app_dir)
+    sys.path.insert(0, app_dir)
+    return app_dir