Added lib creation to the sim_engine Makefiles

Issue #3 : added ar -r ../lib/sim_engine.a ${target}.o to the
sim_engine component Makefiles. Still need to go back and have the
makefiles actually use the library.
Updated sim_engine Makefiles to use sim_engine.a

Issue #3 : All sim_engine component Makefile (i.e. all Makefiles
other than the one for main) now create and use the lib/sim_engine.a
object archive. This makes the build files easier to maintain.
Merge pull request #9 from fpstovall/SE_lib_creation

sim_engine lib creation