Continue to support spring.jpa.hibernate.namingstrategy

In 1.0, the property spring.jpa.hibernate.namingstrategy could be
used to configure Hibernate's naming strategy. This was at odds with
most other configuration where binding to namingStrategy would require
a property with some indication that it was two separate words, for
example: naming-strategy, naming_strategy, or namingStrategy

This commit adds a new setter, setNamingstrategy, to JpaProperties so
that an app that was using namingstrategy in 1.0 continues to work
in 1.1.

Issue #928
Polish
Update docs for new extended health support

fixes #930
Fix multiple typos in documentation, as well as "thread.deamon" typo in actuator
Deprecate and warn on namingstrategy

Deprecate setNamingstrategy() and log a warning letting people know
that they should use `naming-strategy`.

Issue #928
Fix typo in Javadoc

Fixes gh-938
Remove trailing whitespace
Merge branch '1.0.x'
Add servlet path to /error if it is customized

In addition I added some convenience methods to ServerProperties
(servletMapping() and servletPrefix()) for manipulating the
servlet path as provided by the user (e.g. normalizing it into
a valid Servlet mapping path for the DispatcherServlet).

Fixes gh-939, see also gh-936
Make Health and Status immutable

Update Health and Status objects to be immutable, update the existing
builder methods to return new instances and add static convenience
methods to Health.
Rename SimpleDataSourceHealthIndicator

Rename SimpleDataSourceHealthIndicator to DataSourceHealthIndicator.
Add test for servletMapping()
Dont’t auto-configure FreeMarker and Velocity without context-support

Boot’s auto-configuration for FreeMarker and Velocity relies on Spring’s
support for them that’s packaged in spring-context-support. Only
auto-configure them if their respective Spring classes are on the
classpath

Fixes #940
Upgrade to Aether 0.9.1
Merge branch '1.0.x'
Fix typo in warning
Add dependency management for remaining Spring Framework modules

spring-instrument-tomcat is deliberately not included as it is only
required with Tomcat 6 and Boot uses Tomcat 7
Fix Tomcat 8 warnings and Jasper initialization

Fix MalformedURLException warnings caused by Tomcat 8 adding additional
URLs to the TomcatEmbeddedWebappClassLoader.

Add JasperInitializerLifecycleListener to call Tomcat 8's
JasperInitializer which is now required for JSP rendering.

Fixes gh-919
Merge branch '1.0.x'
Make AutoConfigurationPackages.set public

Open up AutoConfigurationPackages.set(...) to allow programmatic
configuration of base packages.

Fixes gh-924