doc(README): added the maven command line to execute a simulation
refactor(SSE Support): updated the simulation with the latest changes of the sse-feature branch of gatling (json representation of the SSE)
refactor(SSE Support): updated the Simulation code with the latest SSE support of the sse-feature Gatling branch (json format of the SSE)
Merge branch 'master' of https://github.com/ctranxuan/gatling2-sse-tests