Putting and then getting dates in a document are altered by u1db

When putting and getting a QML date in the u1db database, the resulting strings are stored differently, even if you don't do any type conversion.

The result is that the resulting date is shifted by the current timezone, rendering an incorrect date.

Small example:

qml: date object to save: "Fri Aug 7 08:15:36 2015 GMT+0200" (value chosen by the user in a datetime picker: 08:15)

This value is jsonified in var current = {"title":"First element","date":"2015-08-07T06:15:36.573Z"}
(so, it offsetted correctly in UTC)

console.log("Before save: " + JSON.stringify(tosave));
db.putDoc(tosave, current.billId);
var after = db.getDoc(current.billId.toString())
console.log("After save: " + JSON.stringify(afterSave));

log is:
qml: Before save: {"title":"First element","date":"2015-08-07T06:15:36.573Z"}
qml: After save: {"date":"2015-08-07T08:15:36","title":"First element"}
-> Looking at the sqlite database, indeed, putDoc() saved "2015-08-07T08:15:36" and not "2015-08-07T06:15:36.573Z". And then, assigning that to a Date variable will reapply again the timezone offest, thinking the string is in UTC, and resulting in 10:15 instead of 08.15.

-> Note that the date element has been altered and isn't returned in the same format The date should be returned unalterned. Then it's up to the user to save the timezone independently if they want.