Fixed grammar issue in `failedToContactExtensionErrorWithActivityError:`
Replaced all occurenced of "1Password App Extension" with "1Password Extension"
Merge pull request #111 from AgileBits/task/fix-grammar-issue-in-failedToContactExtensionErrorWithActivityError

Fixed grammar issue in `failedToContactExtensionErrorWithActivityError:`
Merge remote-tracking branch 'origin/master' into add-low-level-api