Fixes:
>>> from hy._compat import isidentifier
>>> isidentifier(u" 0\n 0")
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "hy/_compat.py", line 47, in isidentifier
tokens = list(T.generate_tokens(StringIO(x).readline))
File "/usr/lib/python2.7/tokenize.py", line 374, in generate_tokens
("<tokenize>", lnum, pos, line))
File "<tokenize>", line 2
0
^
IndentationError: unindent does not match any outer indentation level
