Upgrade to Maven Release Plugin 2.5.2

Release Notes - Maven Release Plugin - Version 2.5.2

** Bug
    * [MRELEASE-555] - update versions does not update intermodule dependencies
    * [MRELEASE-611] - The update-versions goal fails when project is not at a SNAPSHOT version
    * [MRELEASE-834] - release:prepare fails when a system property starting with dependency is given
    * [MRELEASE-871] - Release Tag wrongly created when invoked pom.xml path contains a '.'
    * [MRELEASE-879] - Custom toolchain configuration is not passed to forked Maven executions
    * [MRELEASE-892] - -Darguments doesn't allow -B to be passed to underlying maven executions
    * [MRELEASE-902] - release:prepare fails on Windows since Maven-3.3.x

** Improvement
    * [MRELEASE-552] - Add useEditMode option to release:update-versions
    * [MRELEASE-874] - Improve doc about specifying version of plugin could sometimes be required on command-line

** New Feature
    * [MRELEASE-901] - Goal stage should take parameter localCheckout as well.

** Task
    * [MRELEASE-903] - Update maven-shared-invoker to 2.2
    * [MRELEASE-906] - Upgrade to SCM 1.9.4