Adding PEP8 only lint rule to tox and Travis.
Adding verbose flag and fixing PEP8 violation in test.
Adding *egg files to pep8/lint blacklist.
Merge pull request #217 from dhermes/add-tox-lint

Adding PEP8 only lint rule to tox and Travis.
Removing pylint statements in datastore.entity.

Adding a pylint plugin to suppress the maybe-no-member
statements when type inference fails.