Create ptrans fat jar

-> Makes it easier to consume ptrans (once it will be released): java -jar ptrans-VERSION-jar-with-dependencies.jar
-> Makes it easier to add deps without looking at start.sh

Also, added Maven exec plugin config, so that a simple "mvn exec:java" starts the program
Added commons-cli for ptrans. Overkill for now, but will be useful later when adding new options
multiple-line output seen building on docker containers.
Merge pull request #54 from gkhachik/master

multiple-line output seen building on docker containers confuses maven repo determination
Initial support of collectd in ptrans
Minor: use non-confusing variable names when setting up collectd