irkerhook: Fix handling of non-ascii author name

irkerhook: Fix handling of non-ascii author name

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
---
for non-ascii input, irkerhook.py dies with:

remote: Traceback (most recent call last):
remote:   File "/usr/bin/irkerhook.py", line 484, in <module>
remote:     ship(extractor, commit, not notify)
remote:   File "/usr/bin/irkerhook.py", line 391, in ship
remote:     metadata = extractor.commit_factory(commit)
remote:   File "/usr/bin/irkerhook.py", line 262, in commit_factory
remote:     metainfo = do("git log -1 '--pretty=format:%an <%ae>|%s' " +
shellquote(commit.commit))
remote:   File "/usr/bin/irkerhook.py", line 50, in do
remote:     return unicode(commands.getstatusoutput(command)[1],
locale.getpreferredencoding() or 'UTF-8')
remote: UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in
position 8: ordinal not in range(128)

for e.g. this author name:
$ git log -n1 --pretty="format:%an" | cat;echo
Timo Teräs
$ git log -n1 --pretty="format:%an" | od -x;echo
0000000 6954 6f6d 5420 7265 a4c3 0073
0000013
So:
$ for i in C POSIX en_US.UTF-8;do echo "# $i";LC_ALL=$i python -c
"import locale;print locale.getlocale()[1];print unicode(\"ä\",
locale.getlocale()[1] or 'UTF-8').encode(locale.getlocale()[1] or
'UTF-8')";done
None
ä
None
ä
None
ä