RDISCROWD-5739 Admin Usage Dashboard

[n00rsy]

Issue number of the reported bug or feature request: RDISCROWD-5739

Describe your changes

Adds a new admin usage dashboard that displays totals for following fields:

1. Total projects
2. Total tasks
3. Total taskruns
4. Total projects using NLP component (text-tag)
5. Total projects using annex
6. Total projects using DocX

Usage
Takes url parameter 'months' to specify how many previous months to include in the stats. Examples: http://localhost:5000/admin/usage_dashboard/?months=12
http://localhost:5000/admin/usage_dashboard/?months=24
http://localhost:5000/admin/usage_dashboard/?months=123
etc...

settings_local Config example:

USAGE_DASHBOARD_COMPONENTS = {
    'Annex' : 'annex-shell',
    'DocX' : 'loadDocument',
    'NLP Component' : 'text-tagging'
}

Testing performed

Tested Locally

Additional context

bloomberg/pybossa-default-theme#405

[coveralls]

Pull Request Test Coverage Report for Build 4428380118

• 51 of 52 (98.08%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.004%) to 94.041%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pybossa/view/admin.py	11	12	91.67%

Totals
Change from base Build 4416584718:	0.004%
Covered Lines:	16664
Relevant Lines:	17720

---

💛 - Coveralls

[kbecker42]

Thank you.

[kbecker42]

Could we include an example of the json configuration? Thank you.

[XiChenn]

Feel free to merge as well.

[XiChenn]

great code coverage. feel free to merge.

[n00rsy]

great code coverage. feel free to merge.

Thanks Xi!