Ebookconverter

- refined build failure messages:
- don't report false fails for twitter and facebook
- check moddate to see if files have really been built
- updated ebookmaker and libgutenberg dependencies

- added build failure message to log
- twiddled utility scripts

- updated ebookmaker requirement to 0.7.7
- added cron-dopush-social.sh scripts

- incorporated FileInfo.py and AutoDelete.py
- fixed AutoDelete compatibility
- added fileinfo, autodelete, and cron-dopush.sh scripts
- made sample.env bash compatible
- updated requirements for non pipenv users

- updated ebookmaker to 0.7.5
- updated libgutenberg to 0.5.0

- updated ebookmaker to 0.7.4
- reverted preferred source for covers