#JC-1282 Migration, Entity, DAO, Service
#JC-1282 Tests were fixed.
#JC-1282 Interceptor for banners, but it haven't registered yet.
#JC-1282 Custom tag for banners.
#JC-1251 Added external link entity and DAO.
#JC-1282 Banner uploading.
#JC-1282 Strings moved to resources.
#JC-1282 ID column was renamed.
Merge remote-tracking branch 'origin/develop' into develop.html_banners

Conflicts:
	jcommune-view/jcommune-web-view/src/main/resources/org/jtalks/jcommune/web/view/messages_en.properties
	jcommune-view/jcommune-web-view/src/main/resources/org/jtalks/jcommune/web/view/messages_ru.properties
corrected a type in installation guide
added current state of the project description
added sonar and ci links
JC-1165 Auto subscription to topic on posting reply
#JC-1251 Added migration, Hibernate mapping, DAO test.
Merge branch 'develop' of github.com:jtalks-org/jcommune into develop
#JC-1286 bug fixed
#JC-1282 Changes in banner tag, changes in dialog to upload banner.
#JC-1282 Approach of working with enums was changed.
(JC-1156) auto subscription test case extracted
#JC-1282 Tests and JavaDoc.