ticket:10268: Add more tests for MeasureUnit.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@34893 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10268: Fix TimeUnit to interroperate with MeasureUnit and added test.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@34894 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10268: Make CurrencyUnit to work with MeasureUnit.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@34902 251d0590-4201-4cf1-90de-194747b24ca1
ticket:10268: Make getAvailable tests automatic.

git-svn-id: http://source.icu-project.org/repos/icu/icu/branches/tkeep@34903 251d0590-4201-4cf1-90de-194747b24ca1