Using maven filters to add version number to document content

We should use maven filters so that we can replace strings in document content where version number needs to be updated with each release. Doing such updates manually at every release is really inefficient.

We will have to use 2 filters, one for the specific version say @axis2_version@ to be replaced with for example 1.2 (release version) and second filter for the URLs to change @axis2_version_url@ to be replaced with for example 1_2 as we use the '_' for version specific docs in their URLs.

I hope we can implement this with the next release.

Thanks