Unittests improvement and celery callback

[lucernae]

• Add Run Configuration for Realtime tests (in PyCharm)
• Update REQUIREMENTS.txt
• Remove check-processing-earthquake tasks
• Add support for generating Realtime REST Group for unittests
• Add earthquake fields in models for saving task result
• Refactor serializer to support source_type
• Refactor shake.js to support source_type
• Refactor earthquake views to support source_type
• Include RESULT_SUCCESS constant in inasafe_wrapper.py
• Improve unittests for Realtime service to check hazard generations
• Fix Earthquake landing page
• Refactor urls.py to support source_type
• Create utils.py for common tasks

[codecov[bot]]

Codecov Report

Merging #270 into develop_v4 will increase coverage by 1.35%. The diff coverage is 38.83%.

@@              Coverage Diff               @@
##           develop_v4     #270      +/-   ##
==============================================
+ Coverage       50.89%   52.25%   +1.35%     
==============================================
  Files             129      130       +1     
  Lines            4124     4260     +136     
  Branches          352      367      +15     
==============================================
+ Hits             2099     2226     +127     
- Misses           1954     1955       +1     
- Partials           71       79       +8

Impacted Files	Coverage Δ
...ject/realtime/serializers/earthquake_serializer.py	100% <ø> (ø)	:arrow_up:
django_project/core/settings/celery_config.py	100% <ø> (ø)	:arrow_up:
django_project/realtime/urls.py	100% <ø> (ø)	:arrow_up:
django_project/realtime/app_settings.py	93.1% <ø> (ø)	:arrow_up:
django_project/realtime/apps.py	89.65% <100%> (+2.51%)	:arrow_up:
...project/realtime/tasks/headless/inasafe_wrapper.py	58.82% <100%> (+1.24%)	:arrow_up:
django_project/realtime/utils.py	18% <18%> (ø)
django_project/realtime/tasks/earthquake.py	40% <21.73%> (+19.84%)	:arrow_up:
django_project/realtime/views/earthquake.py	59.74% <30.95%> (-5.14%)	:arrow_down:
django_project/realtime/models/earthquake.py	68.85% <40.47%> (-2.4%)	:arrow_down:
... and 10 more

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