[clean_tex]: New method to clean up a TeX file, that is,

1. remove all redundant comments
2. remove all unused renewcommand\vb* variables
 new / edited questions
Merge pull request #502 from abhinavc/master

New questions and utility methods added
new question
Merge pull request #503 from abhinavc/master

new question
 minor edits
Merge pull request #504 from abhinavc/master

 minor edits to 1/4ih/vw5n4
[cron-git-commit] @ 13.23
[cron-git-commit] @ 13.24
Merge branch 'master' of git://github.com/gutenberg/gutenberg
[cron-git-commit] @ 14.37
 new questions
Merge pull request #505 from abhinavc/master

 new questions
 new question
Merge pull request #506 from abhinavc/master

 new question
[cron-git-commit] @ 20.25
[cron-git-commit] @ 20.26
[cron-git-commit] @ 20.27
[empty_slots]: Should cd into $VAULT
Ignore temp files created by commandline.sh