run_job: new, more explicit script syntax (rest of hashdist still needs porting)
All of hashdist except hashdist.recipes ported to new script syntax
Add Fernando Perez to authors
DOC Fix documentation to include script language docs
BUG run_job: bitrot in error exit; added test
Better error message for easy mistake to make during development
BUG run_job: fix cwd handling
Merge pull request #61 from hashdist/pr-new-script-syntax

hashdist.core.run_job: New script syntax