Update license information
Merge branch 'master' of https://github.com/ajdm/Rgridengineswarm

* 'master' of https://github.com/ajdm/Rgridengineswarm:
  Check that worker, job and chunk ids are really integers
  Fix missing variable in add_workers
  fix typo in default value of worker_name
  roxygenise with roxygen2 v3.1.0
  dev: add Rstudio project file
  set default worker_name in get_chunk()
  table creation - set AUTO_INCREMENT=1
  no need to define worker when adding jobs
  Suggest gridengine has its own working directory
  Provide example of .my.cnf configuration group
  fix: making connection using default mysql group
  fix typo in README