CI: lint for rest of pandas
see output at the end: https://travis-ci.org/jreback/pandas/jobs/102213682

this only shows the summary stats. Once these are much lower we can remove the `-q` and 
show the actual errors.

As more files are fixed can move the checks to `lint.sh`

@wesm
@jorisvandenbossche 
cc @rockg

any objections?
 :+1: 
