Add Python 3 support (closes #16)

README.md

@@ -6,7 +6,7 @@ directories, and more, hopefully providing a great way to get everything
 up-to-date for short periods of internet access between long periods of none.
 
 gitup should work on OS X, Linux, and Windows. You should have the latest
-version of git and at least Python 2.7 installed.
+version of git and either Python 2.7 or Python 3 installed.
 
 # Installation
 

gitup/config.py

@@ -5,9 +5,13 @@
 
 from __future__ import print_function
 
-import ConfigParser as configparser
 import os
 
+try:
+    import configparser
+except ImportError:  # Python 2
+    import ConfigParser as configparser
+
 from colorama import Fore, Style
 
 __all__ = ["get_bookmarks", "add_bookmarks", "delete_bookmarks",

setup.py

@@ -35,8 +35,14 @@ setup(
         "Natural Language :: English",
         "Operating System :: MacOS :: MacOS X",
         "Operating System :: POSIX :: Linux",
+        "Operating System :: Microsoft :: Windows",
         "Programming Language :: Python",
         "Programming Language :: Python :: 2.7",
+        "Programming Language :: Python :: 3",
+        "Programming Language :: Python :: 3.2",
+        "Programming Language :: Python :: 3.3",
+        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3.5",
         "Topic :: Software Development :: Version Control"
     ]
 )