Add a class to manage testsuite properties (#38)

Also add tests that show this class can add/update properties
Can modify properties of all project suites (#38)
fix year to 2013 in license header
Create a test case runner that will modify testsuite properties (#38)
Add integration tests to check testsuite properties modif (#38)
testSuiteProperties works in test goal #38

This is the first version of this parameter. It will be modified in the
future (currently it is a String{]) to be a custom object.
This new Object will let us implement new features such as overriding
properties in a subset of TestSuites.
Fix failing integration test

The test has failed since the implementation of testsuite properties
overriding when using the test goal.
In this test we consider that the runner type parameter is used by the
mojo when we found logs for SoapuiTestCaseRunner.

With the new feature, we add a new custom TestCaseRunner, so the logs
don't exist anymore.
The fix is to make this logs occur and ajust expected logs for the new
runner.
Reduce log verbosity #38
fix typo in error message
Test: testSuite properties overriding in std impl

We can override properties of a given suite by providing a properties
file. This is configured via system properties
Test checks that no property is created

In these tests, we check that a property is only updated for the specific
test suite. We already verified that for other suites that already have a
property with the same name, this property is not updated.
Now we also verify that for suites that previously does not have the
property, the given property is not created.
fix maven execution id
SmartBear impl can override testsuite properties

So we add a test for both oss/pro smartbear plugin to show that we can
override properties for a given testsuite by providing a properties file
Add missing license headers
Modify the testproperties parameter #38

Instead of using an array, we now use a custom object. This will let us
extend this feature in the future.
Merge branch 'feature-38-test-goal-suite-properties'