Merge branch 'develop'

Conflicts:
	composer.json
Checking in changes prior to tagging of version 1.18.0.
Fixes the description to enable version info prompt.
Merge pull request #419 from shinnya/fix/version_info_on_prompt

Fixes the description to enable version info prompt.
Merge branch 'develop'
Checking in changes prior to tagging of version 1.18.1.
Merge remote-tracking branch 'origin/develop'
Checking in changes prior to tagging of version 1.18.2.
refactoriing ReleaseList methods
Add --official option to build release list official site

Since json format is not supported on official site yet, we will
let users use --official option as an alternative solution than the json
file on github
Merge remote-tracking branch 'origin/develop'
Checking in changes prior to tagging of version 1.18.3.
use svg badge
Merge branch 'master' into develop

Conflicts:
	composer.json