Merge pull request #43 from stevenNow/master

Proof vision
comments svg
Merge branch 'master' of github.com:yegor256/blog
vision PUB
comments icon
comments icon
Merge pull request #44 from stevenNow/master

Proof 2000-01-01-contract.md
incremental billing
pictures.rb
jekyll press ignores RSS
typo
pictures fix
rename
links validation
links check
build jekyll
exclude rss.xml from jekyll press
jcg.md
Merge pull request #45 from stevenNow/master

Proof notation and performance
notation PUB