Update Spring to latest released version

org.springframework:spring-aop ........ 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-beans ...... 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-context .... 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-context-support ... 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-core ....... 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-expression ... 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-web ........ 4.1.4.RELEASE -> 4.2.5.RELEASE
org.springframework:spring-webmvc ..... 4.1.4.RELEASE -> 4.2.5.RELEASE
upgrade-to: 4.2.5.RELEASE
rel-date: FEBRUARY 25, 2016
rel-notes: https://spring.io/blog/2016/02/25/spring-framework-4-2-5-available-now
modules: hippo-repository, hippo-site-toolkit, hippo-addon-eforms, hippo-addon-targeting, hippo-cms-utilities, hippo-essentials
advice: Upgrade to 4.2.5.RELEASE
Motivation: This fifth maintenance release in the 4.2 line contains 40 fixes and improvements and is a recommended upgrade for all 4.x users, in particular also from 4.1 now.