Parent pom version updates

[sebb <se...@gmail.com>]

The httpclient and httpcore poms currently define junit.version as 4.9.
httpasynchclient uses 4.8.1.
I think we could update them all to 4.11 and move the definition to
the common parent.

Also, the component poms all currently have local definitions of the
version of build-helper-maven-plugin - I think that could be defined
in the parent pom as a property.

There are also a few other version definitions in the component poms
that could be replaced with references to the existing parent
properties.

Similarly we should probably update the following parent versions:

maven-checkstyle-plugin ............................... 2.9.1 -> 2.10
maven-deploy-plugin .................................... 2.7 -> 2.8.1
maven-install-plugin ................................... 2.4 -> 2.5.1
maven-jxr-plugin ......................................... 2.3 -> 2.4
maven-release-plugin ................................. 2.4.1 -> 2.4.2
maven-surefire-plugin .................................. 2.15 -> 2.16
maven-surefire-report-plugin ........................... 2.15 -> 2.16
org.codehaus.mojo:clirr-maven-plugin ................... 2.5 -> 2.6.1

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