Now it accepts custom classes
Merge pull request #6 from xfer/develop

AndroidActivity now accepts more classes from layout files
handling of null date value
assumed date value of 0 is as good as null
added generic types to findByXXX methods
added test android application for testing Xtendroid
fixed bug in handling of null values in findByFields and changed findAll
to use null
implemented basic database tests and made them pass
added ability to specify operator in findByFields and apply a limit and
offset
cleaned up, updated docs with new findByFields features
added release v0.7
updated documentation
updated doc
Modified TimeUtils.now() to return Date object, and added + and -
operators.
TimeUtils update
added equals operator to Date object in TimeUtils
test for @AndroidActivity
lazy list implementation wip
lazy list wip
added executeForBeanList method that takes a pre-initialized buffer of
object to populate, for use in the LazyList