Compiling under linux complains about missing definition for ostream_iterator. Added include <iterator> to resolve this.
I have a 2.8.x verison of cmake on Linux that doesn´t support the INTERFACE style of library definition. As such, I´ve
replaced the previous INTERFACE reference to the RTI libraries with an explicit pointer to the portico RTI as built on my
system. Probably need to replace this in the future with references to system environment variables.

Also added -std=c++11 to the CXX compile args to get gcc4.8.x on linux to accept the shared_ptr usage in the code.
Updated the build commands for common, perffed and exman to reference the explicit locations for the RTI headers and libraries
(set in the top level CMakeLists.txt) necessitated by the use of cmake 2.8.

The perffed and exman build instructions also require linking against the JVM shared libraries, so that has been added,
referencing a JAVA_HOME environment variable.