Closes #249.

Conflicts:
	bin/autojump
	bin/autojump_data.py
	bin/autojump_utils.py
	tests/autojump_utils_test.py

The original implementation used str.encode() on input and str.decode() on
output. However this would cause UnicodeDecodeError since certain characters
can't be encoded / decoded in ASCII.

The new solution is to use unicode() on all input strings and output UTF-8
encoded strings. This makes the assumption that the shell can handle UTF-8
strings.

The original implementation used str.encode() on input and str.decode() on
output. However this would cause UnicodeDecodeError since certain characters
can't be encoded / decoded in ASCII.

The new solution is to use unicode() on all input strings and output UTF-8
encoded strings. This makes the assumption that the shell can handle UTF-8
strings.

Closes #242.

Closes #228.

Closes #230.

Closes #234, #128.

Update installation.sh.