Revert "Call remove_caps on uninstall #1032"

This reverts commit f56880998805da66ebceb81af0208c58f8f09fe9.
Merge branch 'master' of github.com:pippinsplugins/Easy-Digital-Downloads
Update to Contributing Guidelines
Revert commit
Fixed spelling error
Merge pull request #1052 from sunnyratilal/contib

Updated Contributing Guidelines