#JC-1251 Added external link entity and DAO.
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 Tests and JavaDoc.
Merge remote-tracking branch 'origin/develop' into develop.html_banners

Conflicts:
	jcommune-model/src/main/resources/org/jtalks/jcommune/model/entity/applicationContext-dao.xml