we need some way to see the attributes on all arrays in a dataset

[shoyer]

Options:

1. Display array attributes in the dataset repr, e.g., perhaps something like this:

   <xray.Dataset>
   Dimensions:         (time: 3, x: 2, y: 2)
   Coordinates:
       lat             (x, y) float64 42.25 42.21 42.63 42.59
       reference_time  datetime64[ns] 2014-09-05
       lon             (x, y) float64 -99.83 -99.32 -99.79 -99.23
     * time            (time) datetime64[ns] 2014-09-06 2014-09-07 2014-09-08
     * x               (x) int64 0 1
     * y               (y) int64 0 1
   Variables:
       precipitation   (x, y, time) float64 5.904 2.453 3.404 9.847 9.195 0.3777 8.615 7.536 ...
       temperature     (x, y, time) float64 11.04 23.57 20.77 9.346 6.683 17.17 11.6 19.54 ...
   Attributes:
       lat:
           units: degrees_east
       lon:
           units: degrees_north
       precipitation:
           units: mm
       temperature:
           units: degrees_C
   

2. Add a method or attribute like attrs_map that collects everything together into a single mapping (sort of like DAS in OpenDAP: http://www.opendap.org/api/javaDocs/opendap/dap/DAS.html).

I am leaning toward the later option right now.