Correct punctuation
Update install-pip.rst

missing -- on install-option
Allow the use of a custom remote user backend
Update documentation related to REMOTE_USER_BACKEND
Update dashboard.rst

Replaced the TODO in Changing Default Graph Parameters with appropriate content.
Merge pull request #760 from Kixeye/master-webapp-customremoteuserbackend

Allow the use of a custom remote user backend (master)
Merge pull request #781 from bbrown/patch-2

Update dashboard.rst
Merge pull request #752 from ssoroka-se/patch-1

Update install-pip.rst
Merge pull request #700 from paulgear/patch-1

Correct punctuation