Use a string instead of an integer to represent octal permission values since TOML
doesn't support octal integers.
More helpful error message.
Add 'folder_perm' config option.
Better error message when the failure is due to an unrecognized config setting.
Use underscores in TOML.
Merge pull request #296 from mozilla-services/features/string_perm

Use a string instead of an integer to represent octal permission values ...
Merge pull request #297 from mozilla-services/features/whisper_folder_perm

Features/whisper folder perm
Merge branch 'dev' into features/check_write_perms

Conflicts:
	pipeline/outputs.go
	pipeline/whisper.go