filters: highlight.sh: add css comments for highlight 2.6 and 3.8

v2: add highlight 3.13 as present on Fedora 19

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Fix some spelling errors

Signed-off-by: Přemysl Janouch <p.janouch@gmail.com>
Fix about-formatting.sh

dash failed to parse the script.

Signed-off-by: Přemysl Janouch <p.janouch@gmail.com>
Fix the example configuration

"enable-git-clone" doesn't exist, replaced with "enable-http-clone".

Signed-off-by: Přemysl Janouch <p.janouch@gmail.com>
Add a suggestion to the manpage

So that people wishing to use "enable-http-clone" don't have to find
out the correct settings on their own.

Signed-off-by: Přemysl Janouch <p.janouch@gmail.com>
Fix UTF-8 with syntax-highlighting.py

Previously the script tried to encode output from Pygments with
the ASCII codec, which failed.

Signed-off-by: Přemysl Janouch <p.janouch@gmail.com>