make will not assume man pages already exists

They where removed from the repo by issue #291
Merge pull request #292 from RasmusWL/make-handle-missing-man

make will not assume man pages already exists.
Revert "Ignore *.html and *.1 auto-generated files in man/"
Merge pull request #293 from tj/revert-291-ignore-man-generated-files

Revert "Ignore *.html and *.1 auto-generated files in man/"