[DOXIASITETOOLS-168] Add ability to explicitly load custom Velocity tools

Instruct Velocity to load possible custom tools from /META-INF/maven/site-tools.xml found in the classpath of the Maven Site Plugin.

git-svn-id: https://svn.apache.org/repos/asf/maven/doxia/doxia-sitetools/trunk@1765053 13f79535-47bb-0310-9956-ffa450edef68
2 files changed