When a maven zip is busted, subsequent run will always fail

[Patrick Roumanoff]

I had the case when a download failed midway leaving apache-maven-3.0.5-bin.zip in the local_dir

unzip would fail but script would still continue.

it's ok if running locally, but running from CI make it tricky to delete the borked zip file

idea: if unzip fail, it should delete the zip file and exit with non zero error code

[Patrick Roumanoff]

https://bitbucket.org/mjensen/mvnvm/pull-request/31/failed-unzip-delete-zip-file-and-exit/diff

[Patrick Roumanoff]

PR was merged https://bitbucket.org/mjensen/mvnvm/pull-request/31/failed-unzip-delete-zip-file-and-exit/diff