Create Task class which is the most important domain object

Change-Id: Iee958da3b0ccf270dd8310d845caa097ea7a8ed1
Repository for Task. Task are stored in memory, there is no need to use DB

Change-Id: I39b05d0f8f472ddc2212587f3ef4cec2258089f6
Merge branch 'master' of https://github.com/wojda/Portfolio

Conflicts:
	TimeRecorder/src/main/java/org/danielwojda/timerecorder/domain/Task.java
	TimeRecorder/src/test/java/org/danielwojda/timerecorder/domain/TaskTest.java

Change-Id: I4b5a607291ff135cc97fe7f6a3c2f9d2cf3aa86a