Merge pull request #24 from jcabi/master

merge to my branch
Merge pull request #26 from jcabi/master

merge from master to my repo
issue #279 - Could not run command mvn clean install -Pqulice fixed
#235 RtReleasesITCase.java:63-66 was implemented
Merge pull request #280 from lthuangiang/279

issue #279 - Could not run command mvn clean install -Pqulice fixed
Merge pull request #281 from lthuangiang/235

#281: pull request #235 RtReleasesITCase.java:63-66 was implemented
merge master with upstream