Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/requests/packages.py

@@ -0,0 +1,26 @@
+import sys
+
+try:
+    import chardet
+except ImportError:
+    import charset_normalizer as chardet
+    import warnings
+
+    warnings.filterwarnings('ignore', 'Trying to detect', module='charset_normalizer')
+
+# This code exists for backwards compatibility reasons.
+# I don't like it either. Just look the other way. :)
+
+for package in ('urllib3', 'idna'):
+    locals()[package] = __import__(package)
+    # This traversal is apparently necessary such that the identities are
+    # preserved (requests.packages.urllib3.* is urllib3.*)
+    for mod in list(sys.modules):
+        if mod == package or mod.startswith(package + '.'):
+            sys.modules['requests.packages.' + mod] = sys.modules[mod]
+
+target = chardet.__name__
+for mod in list(sys.modules):
+    if mod == target or mod.startswith(target + '.'):
+        sys.modules['requests.packages.' + target.replace(target, 'chardet')] = sys.modules[mod]
+# Kinda cool, though, right?