Make sure that only ZNC can read its certificate

To bring this certificate in line with how those in ssl.yml are managed.
Merge pull request #213 from thomwiggers/patch-1

Make sure that only ZNC can read its certificate
add cgi module for cgit
Fix README to reflect changes in #176

Change instructions for creating the tarsnap key to generate it at "decrypted_tarsnap.key".
Only install Tarsnap when version is missing

Checks if the exact version of Tarsnap is already installed and, if so,
skips the download and build steps.
Merge pull request #215 from squarepegsys/master

add cgi module for cgit
Merge pull request #222 from yourcelf/patch-1

Fix README to reflect changes in #176
Merge pull request #223 from alexdunae/conditional-tarsnap-install

Only install Tarsnap when requested version is missing
fixes #156

fixes #156 by adding the -L flag, as suggested by @ventolin
Merge pull request #224 from nstanke/patch-2

fixes #156