Unexpected behaviour: Timeresolution increment: 15 -> does 5 minute increments.

[wboard]

When adding a timeResolution option to 15 minute increments.
It changes the default time selectors to go in increments of 5 minutes instead of 30 minutes.
I would have expected it to go in increments of 15 minutes.

Is there another way to achieve this?

    timeResolution : {
        unit      : 'minute',  //Valid values are "millisecond", "second", "minute", "hour", "day", "week", "month", "quarter", "year".
        increment : 15
    },

[mats]

Works well for me, try adding that to the basic demo. How / where can we reproduce this?