Create a better summary view for initial use

[danielbachhuber]

Our current summary view doesn't immediately point out glaring issues:

$ wp profile
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| stage      | time    | query_time | query_count | cache_ratio | cache_hits | cache_misses | hook_time | hook_count | request_time | request_count |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| bootstrap  | 2.0408s | 0.0365s    | 15          | 93.21%      | 412        | 30           | 0.9299s   | 3097       | 0s           | 0             |
| main_query | 0.0123s | 0.0004s    | 3           | 94.29%      | 33         | 2            | 0.0098s   | 79         | 0s           | 0             |
| template   | 0.305s  | 0.0175s    | 179         | 91.02%      | 2636       | 260          | 0.1125s   | 7777       | 0s           | 0             |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+
| total      | 2.3582s | 0.0544s    | 197         | 92.84%      | 3081       | 292          | 1.0522s   | 10953      | 0s           | 0             |
+------------+---------+------------+-------------+-------------+------------+--------------+-----------+------------+--------------+---------------+

It would be nice if we had a summary view that made it more immediately obvious where the problem areas are.

Related #61