Expose Axis tier intervals.

Right now there is no endpoint to manipulate possible time intervals for major and minor ticks.
With this PR I introduce an API endpoint to provide custom time intervals.
To cover basic scenario I provide function, which easily can filter existed interval within some range. It might go directly to previously mentioned API, which will accept array or desired range.

Close #1212.
Right now I don't see any particular use cases, which would need extending it. My argument is that it is more understandable when you see this interface instead of array of array. What is main concern beside more code to write?