Fix build profile to respond to a simple maven install command

Fix build profile to respond to a simple maven install command

Inheritance in maven works if and only if the child POM also declares the
plugin with/out any execution(s) or configuration(s). Thus mentioning
assembly plugin in every POM resolved the problem. From now on the
following command will build the complete project with distributions as
well.

mvn clean install -Dbuild.complete=true -Dbuild.complete.dist=true

Also README filtering is done in site profile just to ensure that if later
READMEs' are included in the site then its available.

Updated the README with latest build notices.

Signed-off-by: Imran M Yousuf <imyousuf@smartitengineering.com>