Although using %t to lint changes was desirable, many pylama checks use
surrounding paths and file contents (e.g. C0103 module name, E0402
relative import beyond top, etc.) The more such errors I find during
testing, the less %t seems like a good idea. Switch to %s.
Also set `lint_file` to 1 and mark Pylama as a file linter in the docs.
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>