Timezone compatibility

The difference in timestamps between the failing Travis tests (http://syncany.org/reports/all/classes/org.syncany.tests.database.dao.DatabaseVersionDaoTest.html) and the expected value is exactly one hour. I hope adding the timezone upon insertion fixes this. 

As I understand http://www.hsqldb.org/doc/2.0/guide/sqlgeneral-chapt.html#sgc_datetime_types Java should not be altering times relative to the timezone, which (I think) is what we want.