Add initial iipsrv container from Getty (no JP2 encoder)

[glenrobson]

Discussed in the meeting:

• Add nginx
• Separte docker for openjpeg and kakadu

Kakadu

• keep code out of github build from local copy.
• Would be better to build kakadu in the docker from source code.

[glenrobson]

Two dockers (or one docker which you can choose which jp2 encoder):

• Openjpeg
• Kakadu

[scossu]

@glenrobson @ruven @michaeldsmith This is ready for merging and testing with Gatling. See the updated README.