time & date can accept strings with formatted times & dates

### Set times & dates via formatted strings!

So now things like
```ruby
object.time_field = "2013-04-28 12:00:00 -0400"
```
or
```ruby
object.time_field = "1364680270" # epoch time
```
Totally works!  Also this sets the `int_value` of meta_content thingy to epoch time properly. A lazy hack might have entailed just setting the `str_value`.