Remove support for narrow builds (closes #61)

The possibility for 'narrow' builds of CPython went away with Python 3.3

tests/test_unicodedata2.py

@@ -14,41 +14,6 @@
 encoding = 'utf-8'
 errors = 'surrogatepass'
 
-MAX_UNICODE_UCS4 = 0x10FFFF
-
-if sys.maxunicode < MAX_UNICODE_UCS4:
-    # workarounds for Python "narrow" builds with UCS2-only support.
-
-    _narrow_unichr = chr
-
-    def chr(i):
-        """
-        Return the unicode character whose Unicode code is the integer 'i'.
-        The valid range is 0 to 0x10FFFF inclusive.
-        >>> _narrow_unichr(0xFFFF + 1)
-        Traceback (most recent call last):
-          File "<stdin>", line 1, in ?
-        ValueError: unichr() arg not in range(0x10000) (narrow Python build)
-        >>> chr(0xFFFF + 1) == u'\U00010000'
-        True
-        >>> chr(1114111) == u'\U0010FFFF'
-        True
-        >>> chr(0x10FFFF + 1)
-        Traceback (most recent call last):
-          File "<stdin>", line 1, in ?
-        ValueError: chr() arg not in range(0x110000)
-        """
-        try:
-            return _narrow_unichr(i)
-        except ValueError:
-            try:
-                padded_hex_str = hex(i)[2:].zfill(8)
-                escape_str = "\\U" + padded_hex_str
-                return escape_str.decode("unicode-escape")
-            except UnicodeDecodeError:
-                raise ValueError('chr() arg not in range(0x110000)')
-
-
 ### Run tests
 
 # NOTE: UnicodeMethodsTest upstream tests methods on `str` objects, and