A few updates to Slinky for the 0.3.0 release

Slinky Dockerfile

• Collapsed the redlands installation steps into a single layer
• Removed /var/lib/apt/lists/ (don't need it after package installs) cite
• Runs slinky & pip under the user 'slinky' (removes warnings about running as root)
• Upgrades pip to lates & removes redundant python install (removes more warnings)

Virtuoso

We had two copies of our custom Virtuoso Dockerfile. I removed the redundant one in the test directory

dump-virtuoso

This script requires you to have the dump_nquads function defined within Virtuoso (which default deployments no longer do). I added this function and another bit to copy the data files out of the container.

Web

Addresses a few points in #73. Since the page depends on yasgui and the css, I left them as blocking resources.

Triple Pattern Changes

I ran the SOSO 1.2.3 SHACL file against the triples we're producing in develop with

pyshacl -s ~/science-on-schema.org/validation/shapegraphs/soso_common_v1.2.3.ttl -m -i rdfs -f human data.nq

These are the results. This PR currently fixes the keywords violation and sameAs warning.

• We currently use schema:keyword for describing keywords - but it should be schema:keywords
• We're using owl:sameAs where SOSO wants schema:sameAS. Adding both might not be a bad idea (but I went with only using schema)

there was a second violation with schema:version - but I filed an issue for that one.

Google Recommended

We fail a few of the recommended google shapes (we pass the required one though).

For 0.3.0 these might not be worth addressing and could go in a 0.3.1.