Resolve "Implement "suggested content" on material page"

Closes #10

added AP19 statustodo prioritized labels

assigned to @ning.xia

added 8 commits

• 00aba6af - init recommendation app
• d3458670 - added api model for suggestions of related content of a material
• 6e373597 - implemted query for suggested content, using just schema:isPartOf attribut
• b12258e8 - added serializer for suggested contents
• aaddc2b4 - added view for suggested contents
• dea0df1a - added endpoint for suggested contents
• b5bccac4 - added recommendation app in main config
• 864a7d0c - added tests for recommendation query building

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added 2 commits

• 931389b8 - changed uri in query, now using constant defined in dalia app
• 3be0232b - updated tests

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added 1 commit

• cd7717de - add query keywords

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added 2 commits

• e6f974ea - change order of social_media list of communities
• a21bfd99 - update facet items

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added 1 commit

• ecfa388b - Get suggested content considering different ranking metrics

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added 83 commits

• ecfa388b...c00a1e92 - 80 commits from branch dev
• 450bfdf0 - merge dev
• 00a6fcd7 - finished /items/{}/recommendations api end point according to the doc
• 20e5a880 - added test for call the functions of endpotin /items/{}/recommendations

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marked this merge request as ready