Upgrade to Spring Framework 4.1.3.BUILD-SNAPSHOT

Upgrade to the SNAPSHOT so that CI will catch any problems early.

See gh-2038
Retain YAML property ordering

Update YamlPropertySourceLoader to use a MapPropertySource rather than
a PropertiesPropertySource to ensure that the underlying order is
retained.

Fixes gh-2022
Correct ApplicationPidFileWriter property javadoc

Fixes gh-2041
Add exclusion for well-known property types

Previously, any valid property was added to the meta-data of the current
group. This can be annoying for types that are not meant to be bound from
a simple string value. ClassLoader is one example.

A list of well-known types has been added: if the property type matches
an element of this list, it is ignored.

Fixes gh-2012