Smqtk

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This patch release addresses a bug with PostgreSQL implementations incorrectly
calling a helper class.

===========================

This minor release represents the merger of a public release request that added a
Girder-based implementation of the DataElement interface. We also optimized the
use of the PostgreSQL DescriptorIndex implementation to use named cursors for
large queries.

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This minor release incorporates various fixes and enhancements to
representation and algorithms interfaces and implementations.

A new docker image has been added to wrap the IQR web interface and headless
services. This image can either be used as a push-button image ingestion and
IQR interface container, or as a fully feature environment to play around with
SMQTK, Caffe deep-learning-based content description and IQR.

A major departure has happened for some representation structures, like
DataElements, as they are no longer considered hashable and now have interfaces
reflecting their mutability. Representation structures, by their nature of
having arbitrary backends, may be modifiable my external agents interacting in
a separate manner with the backend being used. This has also opened up the
ability to provide algorithm implementations with DataElement instances instead
of filepaths for desired byte content and many implementations have
transitioned over to using this pattern. There is nothing fundamentally wrong
with requesting file-path input, however it is restricting as to where
configuration files or data models may come from.

This is a patch release with bug fixs for the Docker wrapping of RESTful services introduced in v0.6.0.

This minor release provides bug fixes and minor updates as well as Docker
wrapping support for RESTful services, a one-button Docker initialization script
for a directory of images, and timed IQR session expiration.

The `docker` directory is intended to host container Dockerfile packages as
well as other associated scripts relating to docker use of SMQTK. With this
release, we provide a Dockerfile, with associated scripts and default
configurations, for a container that hosts a Caffe install for descriptor
computation, replete with AlexNet model files, as well as the NearestNeighbor
and IQR RESTful services. This container can be used with the
`docker/smqtk_services.run_images.sh` for image directory processing, or with
existing model files and descriptor index.

The IQR Controller class has been updated to optionally time-out sessions and
clean itself over time. This is required for any service that is going to stick
around for any substantial length of time as resources would otherwise build up
and the host machine would run out of RAM.