icebox:

Added initial sketch of icebox app.
oq-platform-install.sh:

Added icebox to install script.
oq-platform-install.sh:

Removed a bunch of trailing whitespace.
oq-ui-api/bin/makefile.sh:

Added symlink statement for icebox, so that the app is installed
properly.
oq-ui-api/bin/makefile.sh:

Cleaned up some trailing whitespace.
oq-ui-api/geonode/icebox/models.py:

Proper foreign key to django User table.
oq-ui-api/bin/oq-platform-install.sh:

Simplified some echo statements detailing installation status.
oq-ui-api/geonode/icebox:

Renamed `result` to `artifact`, since the icebox could be used to
store not only calculation results but input models as well.

In the future, they might also be linked together in some way.
oq-ui-api/geonode/icebox/views:

Basic implementation of `list_artifacts` and `import_artifacts` views.
oq-ui-api/geonode/icebox/views:

Pyflakes fixes.
Renamed run-exposure-tests.sh -> run-tests.sh
oq-ui-api/geonode/icebox/views:

Completed implementation of all basic icebox views.
oq-ui-api/geonode/icebox/views:

Minor punctuation adjustment to the import_artifacts view response
message.
oq-ui-api/geonode/icebox/tests:

Added tests to achieve 100% code coverage for icebox.views.
oq-ui-api/run-tests.sh:

Updated test script to run icebox tests as well.
oq-ui-api/geonode/icebox/icebox_api.md:

Added icebox api markdown doc. It's empty for the moment and needs to
be filled out.
oq-ui-api/geonode/icebox/icebox_api.md:

Added REST API doc for icebox.
oq-ui-api/geonode/icebox/icebox_api.md:

Rewording, typo fixes, and formatting cleanup.
Merge pull request #51 from larsbutler/icebox

Icebox: initial implmentation

[r=bwyss,matley] [f=1216832]