Created TaskController and added Create task link to the nav bar

Details
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Several additional improvements as well:
1- Created acceptance test, controller unit test and view unit tests
regarding with UC2
2- Used spring Jdbc transaction aware proxy wrappers while passing
DataSource for creating a connection
3- Reused test conntents and helpers created in the datastore inside
of acceptance module
4- Conflicts resolved for slf4j-api-1.5.6. Collected logging related
adapter libraries in the logging module so that dependant modules
can share the same configuration.
5- Some common dependancies managed in the parent pom.xml

Ticket
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closed #35 closed #39