Add PEP8 checker
Fix PEP8 code style
Add the size of a resource to its metadata.
Add the last-modified date of the metadata file to a resource's metadata.
Add version from metadata file to resources list.
Removed debug text.
Merge pull request #6 from ogdch/ogd-64

OGDCH-64: Add 'size' and 'version' fields to ressource metadata
Fixed merge conflict.
Added travis build.
Added flake8 to pip requirements.
Merge pull request #7 from ogdch/develop

Release 1.0.2