Merge branch 'version/bump'

Bump to 2.1.2dev
[#3705] Fix autoload.files setting in composer.json

- Because we have a target-dir, the autoload.files path needed to be prefixed
  with that target-dir to continue to be valid.
[#3705] Similar fix for Zend\Session

- ensure autoload.files is prepended with value of target-dir.
Merge branch 'weierophinney-hotfix/3705' into develop