[rules-dev] change "assert" to "insert"

[Mark Proctor]

We have been getting querries with regards to jdk assert collision and 
jboss rules assert, for this reason we are thinking of changing it to 
insert for 4.0. Further to that its causing language integrations issues 
for us as we expand pluggeable dialects. For this reason we are thinking 
of chaning assert to insert, this would be an api change and a language 
level change. I'd thought I'd throw this out to the community before we 
do it. This of course breaks backwards compatability.

Mark