Revert "fixed coveralls config"

This reverts commit f20a7ee25cb12391bcf4671ba09c67948eb54e4d.
Revert "coveralls badge"

This reverts commit 50717a4133c30b186e1581f0575bbb08c0f0d6dc.
Revert "coveralls"

This reverts commit 48f728b74ba5eabbc811d2af2e772642ba66635c.
karma-coverage