Started work on a migration guide.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620038 13f79535-47bb-0310-9956-ffa450edef68
Added a section about accessing configuration data.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620039 13f79535-47bb-0310-9956-ffa450edef68
Added a section about creating configurations.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620040 13f79535-47bb-0310-9956-ffa450edef68
Added a section about reloading.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620041 13f79535-47bb-0310-9956-ffa450edef68
Added a section about CombinedConfigurationBuilder.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620042 13f79535-47bb-0310-9956-ffa450edef68
Added a section about concurrency.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620043 13f79535-47bb-0310-9956-ffa450edef68
Added a section about the new event mechanism.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620044 13f79535-47bb-0310-9956-ffa450edef68
Added an introduction section.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620045 13f79535-47bb-0310-9956-ffa450edef68
Added a linkt to the migration guide to the side bar menu.

Fixed some typos, some minor improvements.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620046 13f79535-47bb-0310-9956-ffa450edef68
[CONFIGURATION-579] Updated changes.xml.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620047 13f79535-47bb-0310-9956-ffa450edef68
Updated index page with information about version 2.0 alpha.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620048 13f79535-47bb-0310-9956-ffa450edef68
Changed version number for an upcoming alpha release.

Updated properties for the generation of the download page.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620049 13f79535-47bb-0310-9956-ffa450edef68
Regenerated download page.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620050 13f79535-47bb-0310-9956-ffa450edef68
Missing svn properties.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1620051 13f79535-47bb-0310-9956-ffa450edef68