Fix skipfields use with SHP output format. Closes #81
Fix Content-Disposition for error responses. Closes #82
Check CDB_QueryTable response before saving into cache

Also add pid to /cachestatus (#83)
Add test focused on x-cache-channel handling
Use an LRU cache for query tables, and add expiration support

Defaults to 8192 items each valid for no more than 10 minutes
Both settings can be changed via environment config.
See #83
Do not attempt to compute an X-CacheChannel from a broken query info

Also enhance debugging for broken query info results
Ignore node_module* permutations
Updagres pg module
Fix X-Cache-Channel computation with paging parameters. Closes #85.
Revert "Updagres pg module"

This reverts commit d418db03e41779be2bdf1aab5067cd7e7948d12b.

The problem we were after was elsewhere.
Upgrading pg module may still be a good thing but needs to be
done togheter with generic-pool and also needs updates to
shrinkwrap file
Add test for multi-statement and begin/commit
Merge branch 'release/staging'