feat(enc): test with unicode tmpdir

Borrowed from gitpython-developers/GitPython#543

Author: ankostis

.travis.yml

@@ -6,13 +6,15 @@ python:
   - "3.4"
   - "3.5"
   # - "pypy" - won't work as smmap doesn't work (see smmap/.travis.yml for details)
-
+env:
+  - TMPDIR: "/tmp/καλημέρα"
 git:
   # a higher depth is needed for one of the tests - lets fet
   depth: 1000
 install:
+  - ln -s /tmp "$TMPDIR""
   - pip install coveralls
-script: 
+script:
   - ulimit -n 48
   - ulimit -n
   - nosetests -v --with-coverage