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.
Since I believe we're using typedoc, we should use something like this as a template http://typedoc.io/api/interfaces/typedoc.iapplication.html I believe.

If it's going to be up to us to create documentation and how to style it rather than the docs team, we might actually want to store something locally so we can at least test our doc