Fixed issue that relative -path was prepended each time compute was started to each of the parameters that comprise a path.
Added all command line parameters as reserved words
Added validator which checks input-parameter names on allowed characters
And the validator which i forgot in prev commit
Added create(path) function for George so that he can easily start the impute2 pipeline
Merge pull request #298 from mdijkstra/master

Fixed bugs. Improved compute.properties class.