Replace hamcrest with assertj

replaced final hamcrest usage with assertj.
Add docTypes to remove eclipse warnings

In context.xml files, add empty docType to remove warnings in eclipse.
Removed unnecessary import
Updated dependencies.

junit to 4.12-beta-1
maven-deploy-plugin to 2.8.2
maven-install-plugin to 2.5.2
spring3 to 3.2.11
spring4 to 4.1.0
tomcat8 to 8.0.12