Added BasePathLocationStrategy.

This FileLocationStrategy implementation tries to construct a path name from
the specified base path and file name.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1525399 13f79535-47bb-0310-9956-ffa450edef68
Added HomeDirectoryLocationStrategy.

This FileLocationStrategy implementation searches for files in a configurable
home directory.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1525400 13f79535-47bb-0310-9956-ffa450edef68