Replace RelatedObject with ForeignObjectRel (Django 1.8+)

[rodxavier]

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[landscape-bot]

Repository health decreased by 0.39% when pulling d7516da on rodxavier:master into 38792a7 on treyhunner:master.

• 4 new problems were found (including 0 errors and 1 code smell).
• No problems were fixed.

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Repository health decreased by 0.15% when pulling 6be07a8 on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.13% when pulling 2130099 on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.12% when pulling 3622f6d on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.12% when pulling 374793b on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.12% when pulling 6ff2a15 on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

[landscape-bot]

Repository health decreased by 0.12% when pulling 6ff2a15 on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.12% when pulling ede44cc on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.

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Repository health decreased by 0.16% when pulling 681ccbe on rodxavier:master into 38792a7 on treyhunner:master.

• 3 new problems were found (including 0 errors and 0 code smells).
• No problems were fixed.