#6 Ignore jms mocks if not present

[Jeffrey D. Brekke]

Updated the build.xml to skip compiling the jms mocks
if the javax.jms.Message class cannot be found in the
classpath, much like how the servlet stuff is skipped.

Changed the order of build.properties processing to
read the user's build.properties before the project's
build.properties. This way you can define locations
and use them in the specific props for projects.

Added a commented out property lib.dir to the
build.properties.sample to show that the entire lib
directory could be changed with a small setting in your
local build.properties.

[Steve Freeman]

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