HUE-1833 [spark] Gracefully fail when the server is not up

Added error page and exception catching on API
HUE-1822 [beeswax] Re-integrate columns in result tab

Added columns tab back
Added jump to column functionality
Added smarter sorting for columns
HUE-1657 [oozie] SLA search/lookup
HUE-1656 [oozie] SLA edition
HUE-1657 [oozie] SLA search page
HUE-1656 [oozie] SLA edition by Workflow action
HUE-1657 [oozie] Dynamic SLA search page

Starting workflow SLA page
HUE-1656 [oozie] Create empty SLA on new nodes

Second node will use the same values for now.
HUE-1656 [oozie] Create Coordinator SLA
HUE-1656 [oozie] Add 2 new SLA fields
HUE-1656 [oozie] Adding parameters to SLA
HUE-1657 [oozie] Basic SLA parsing for workflows

Bump workflows to 0.5
SLA fields are not imported yet
HUE-1656 [oozie] Make data fully integrated in the API part 1

Now we just need to add a ko.obervable for the new fields we want to
edit and that's it.
[oozie] Front end for SLA

proper ko.mapping support for SLA and unstructured data.
models are automatically updated when view models update.
use better rendering semantics.
HUE-1656 [oozie] Make data fully integrated in the API part 2
HUE-1803 [oozie] Support global configuration

Workflow global properties are split in two parts:
  - regular properties
  - config
[oozie] Front end for SLA

Remove model during serialization phase and use view model.
HUE-1803 [oozie] Global configuration mapping
HUE-1803 [oozie] Support global configuration

Front end for global config.
HUE-1452 [oozie] Credentials by action for Oozie workflows

Credentials enabled only when Oozie is using security.