Use new format for storing and loading tweets
Merge branch 'master' of
https://github.com/ophirdj/Software-Design-using-API.git

Conflicts:
	twitter-knowledge-center/src/test/java/ac/il/technion/twc/TimeConstraintsTest.java
Merge branch 'master' of https://github.com/ophirdj/Software-Design-using-API.git