Import from skbio instad of pycogent

This will depend on brokit, so wait on the merge of brokit modules that
@josenavas is working on
Merge pull request #1432 from adamrp/skbio_app_util

Import from skbio instad of pycogent
Remove unused imports of unzip

This function was not being used anywhere in these modules.
Merge pull request #1437 from ElDeveloper/remove-unzip-usage

Remove unused imports of unzip
fixing 2 files, missing 1
will it work?