Fixes for filenames that include spaces

[prodonjs]

#71
Fix Commands that reference a filename so that the portion of input following the command name and space are considered to be the full path to the file. In the current head, this was being split on the space character and therefore would fail on paths that contained spaces.

[julianhyde]

Thanks for this PR. Rather than taking the rest of the line including spaces, I think we should allow quoted file names. For example,

!run "/foo/ bar baz/script with spaces.sql"

I think it would be more consistent with people's expectations; it would also allow us to add more arguments to !run in future. You've already added tests, so if you make this change I will accept your PR.

[prodonjs]

Added the change to respect quoted filenames. This doesn't handle the generic case of having more arguments to a command like run, but I was running into issues even when passing the properly quoted name of the script through the shell. Java would correct pass the full path in main()'s args, but at that point the quotes would be removed. The change I made in SqlLine addresses that.

[julianhyde]

Fixed in c1ac008. Thanks for the PR!