Fixes #47

TODO: Implement caching mechanism to speed up the process

+ Change logic detecting if article was modified
Fixes #43

Explicitly order all commits

Configuration option (config.toml):

[git]
mergeMessage = "array or string"

Fixes #38

Example usage:

node query.js --sql "select metadata.tags as tags, metadata.title as title where count(metadata.tags) == 1 and contains(metadata.tags, 'Článek');"

prints list of articles which have only tag "Článek" - usefull for
listing not yet tagged articles

if path contains "git". Should be if contains ".git"

Fixes CI builds

1. More robust href parameter parsing
2. Split youtube-related code (except html) to separate file
3. Unit tests for 1 and 2
4. Heading "Hello - world" now generates "hello-world" anchor instead of
   "hello---world" (no more duplicated hyphens in urls)

1. Not building without build/theme directory (race condition)
2. Wrong defaults for contentdir
3. Other bugs caused by those. Fixes #32 and #33

Fixes #31

and add few command line options

use ./index.js --help to learn more

metadata to disable: `notarticle = true`

Also simplified theme.js and writeFiles.js which also fixed weird bug
Fixes #22

Fixes #4

Just write ![alt](img.png =x123,nolightbox)
or ![alt](img.png =nolightbox)

Also fixed tables being too big