Fix issues.

tehmaze#67
tehmaze#68
All tests (tehmaze#69) is passed for this code.
May be this fix will be useful.

Author: bazhil

ipcalc.py

@@ -165,7 +165,7 @@ def __init__(self, ip, mask=None, version=0):
             raise ValueError('Invalid netmask')
 
         #hard fix https://github.com/tehmaze/ipcalc/issues/67
-        if self.v != 6 and len(self.dq) > 15 and ':' in self.dq:
+        if self.v != 6 and (len(self.dq) > 15 or ':' in self.dq):
             self.v = 6
 
         # Validate subnet size