python 2.5 incompatible api

[lukaszb]

File '/py25vir/lib/python2.5/site-packages/vcs-0.1.10-py2.5.egg/vcs/
backends/hg.py', line 376 in get_file_annotate
for ln_no, annotate_data in enumerate(fctx.annotate(), 1):
TypeError: enumerate() takes exactly 1 argument (2 given)

Needs to be fixed for python 2.5

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Reference: https://bitbucket.org/marcinkuzminski/vcs/issues/38/