OpenJDK Upgrade

This change updates OpenJDK to 1.7.0_25.

[#52036531]
Merge 52036531-openjdk-upgrade to master

[Completes #52036531]
Merge pull request #7 from ramnivas/master

Switch to auto-reconfig version 0.6.8
Add RemoteIpValve

As the Tomcat instance created by this buildpack is always located
behind a proxy, this change adds the RemoteIpValve to the Tomcat
configuration.  This change ensures that functionality such as
HttpServletRequest.isSecure() works properly in the Cloud Foundry
environment.

[#52956737, #8]
Merge 52956737-remote-ip-valve to master

[#52956737]
Incorrect server.xml

The previous change created an invalid server.xml file.  This fixes
the problem.

[#52956737, #8]
Update auto-reconfig to fix vcap-java issue #30