Merge pull request #5 from hawesie/hydro-devel

Added launch file.
Merge pull request #8 from hawesie/hydro-devel

Using proper nodes from datacentre via ros param.
Merge pull request #9 from hawesie/hydro-devel

README written for basic usage
Merge pull request #11 from hawesie/hydro-devel

Added int and float arguments to task execution.