Create separate containers for search and depict

[tdudgeon]

As part of https://app.clubhouse.io/informaticsmatters/story/1447/clean-up-fragnet-search-deployments we need to generate separate containers for the fragnet-search and fragnet-depict webapps.

[tdudgeon]

This commit (on issue37_separate_search_and_depict_containers branch) generates separate squonk/fragnet-search and squonk/fragnet-depict containers.
They can be generated using ./gradlew buildDockerImages.
f03cb3c

Next need to adjust Travis to automatically build and push those images