added Divide functionality
[Unfinished] add multiply operation

more explained message here
corrected junit version
Merge branch 'addMultiplyOperation'

Conflicts:
	org.eclipse.example.calc/src/org/eclipse/example/calc/internal/Calculator.java
moved TODO Tasks
added comments to branch comments
Merge branch 'comments'
javadoc comments for rebase
rebase again
rebase 2. Also changed file which was changed in rebase
removed empty lines for tests
fixed UID