Remove gendered pronouns

When referencing hypothetical users, it's more inclusive to use
gender-neutral prnouns. Instances of he/she/his/her/him have been
replaced with they/them/their and verb tenses changed to match.
minor #879 Remove gendered pronouns (epochblue)

This PR was merged into the 1.0 branch.

Discussion
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Remove gendered pronouns

When referencing hypothetical users, it's more inclusive to use
gender-neutral prnouns. Instances of he/she/his/her/him have been
replaced with they/them/their and verb tenses changed to match.

Commits
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c48da4c Remove gendered pronouns
Merge branch '1.0' into 1.1

* 1.0:
  Remove gendered pronouns
Merge branch '1.1'

* 1.1:
  Remove gendered pronouns