Add build step to prepare configured environment for running RelEx services

[vsbogd]

Shell scripts to run RelEx services contain hardcoded Java classpath with all requried dependencies. The classpath can be different on different machines then it should be edited manually. There are few possible solutions to get rid of this editing:

• shell scripts can be generated during build including all libraries which were used
• build can produce fat .jar or app folder and copy all necessary dependencies into it

appassembler-maven-plugin can be used for maven build.