escape variables not to be interpolated
escape variables not to be interpolated

git-svn-id: f1a17a061676d963c74b394b439ef1ab9f189971@8868 52ab4f32-60fc-0310-b215-8acea882cd1b

mohanaraosv/properties-maven-plugin,ozimov/yaml-properties-maven-plugin,akuhtz/properties-maven-plugin,mojohaus/properties-maven-plugin,ozimov/yaml-properties-maven-plugin