Documents
Merge branch 'master' of https://github.com/ophirdj/Software-Design.git

Conflicts:
	twitter-knowledge-center/src/test/java/ac/il/technion/twc/histogram/DayHistogramBuilderTest.java
	twitter-knowledge-center/src/test/java/ac/il/technion/twc/lifetime/LifeTimeBuilderTest.java