Merge pull request #19 from ggu-talend/master

TUP-2403: refactor the duplicated packages.
TDQ-8781 resolve all compile error for Test Plugin.
TDQ-8781 Studio with Eclipse 4.4: replace deprecated APIs for DQ plugins
dependent on org.junit instead of org.junit4
TUP-2473: impl the showPerspectiveAtStartup for DQ.