fix #1282 -- unslugify titles from filename regexps.

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
allow skipping discarding numbers in unslugify

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
do not break old sites

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
missing one instance

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
fix typo [ci skip]

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
add warning about UNSLUGIFY_TITLES’ default value

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
Merge pull request #1283 from getnikola/unslugify-titles

fix #1282 -- unslugify titles from filename regexps.