Return code is always 0 (except when it isn't)

[rossjones]

Regardless of whether the input is Valid or Invalid, csvlint returns 0. This makes it hard to use it in a script to determine whether the input was valid or not.

> csvlint a_bad.csv; echo $?
> 0

> csvlint unicorn.csv; echo $?
> 0

usage, triggered by csvlint does return 1 as an exit code, but I think it is normal for usage/help to return 0.

> ls --help; echo $?
...
GNU coreutils home page: <http://www.gnu.org/software/coreutils/>
General help using GNU software: <http://www.gnu.org/gethelp/>
For complete documentation, run: info coreutils 'ls invocation'
0

> ls -?; echo $?
ls: invalid option -- '?'
Try `ls --help' for more information.
2

[davidread]

Granted the CLI was only a quick addition, I'll add my vote for these improvements. Plus, it would be great to be able to supply a schema as a parameter. (Note to self: learn Ruby to do these sorts of things myself)