2.11 for 5.7

backchange 2.10 for 5.6 build

bump for 5.5

Merge branch 'pr/423'

Merge branch 'pr/423'

Revert "no engine specifier"

This reverts commit 7c96183.

fix include for 5.3

Merge branch 'pr/387' into feature-5.3

5.2 update and extra auth

can append more key:value pairs to auth map sent on connect

5.2 update and extra auth

can append more key:value pairs to auth map sent on connect