Bump version 0.5.1 -> 0.5.2

Change-Id: Ic1664d644fb45a5dce3c9097efa49fbf59270d7a
Reviewed-on: http://gerrit.causes.com/38697
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Joe Lencioni <joe.lencioni@brigade.com>