v0.7.9: Changes:
* info command improvements: * now you can do info on non-tabular files and get a desctiptor for it * now 'info' command works with Excel files * better error messages: * error message when pushing inlined dataset since we do not support it yet * more descriptive message when user "cat"s invalid URLs * more descriptive message when user "push"s empty files * general error throwing logic improvements in "datahub-client"