Add note about dependent bundles being read-only.
typo
Merge pull request #116 from froystig/pliang

Note that dependency targets are read-only during a run
worker returns more information about the process; when internal error, don't retry, just fail the process and return the error
don't fail on copy_remote_to_local
fail run if can't start it (don't try again); don't follow symlinks when copying bundles for safety
add some more examples
make success explict field in result rather than relying on exitcode
remove notion of hard_dependencies; make bundles are just a copy of their dependencies; this avoids having to implement recursion
Merge branch 'master' into pliang
if Ctrl-C, set the correct exitcode (130)
Merge pull request #118 from codalab/pliang

improve robustness of the worker