atlassian repository added to have project buildable
BrokenBuildHook refactored to reuse
org.junit.Assert instead of junit.framework.Assert
replace mock method with annotations
BuildState enum with UNDEFINED added to get rid of "null" checks
add companion plugin - for rejecting merge into blocked builds
if-else-if refactored
known issue added
\n removed as it shown as abnormal character in IDEA log
Reverted: "\n removed as it shown as abnormal character in IDEA log"
cause after that IDEA doesn't show reject message at all.
Merge pull request #1 from F-Secure/master

Merge blocker companion hook + refactoring.