Make report_line function signatures consistent across all reporters

[harveyr]

It seems like this needs to be done? I'm currently getting this error when running with --no-post:

Traceback (most recent call last):
  File "/mnt/services/jenkins/workspace/imhotep/imhotep/bin/imhotep", line 9, in <module>
    load_entry_point('imhotep==1.0.1', 'console_scripts', 'imhotep')()
  File "/mnt/services/jenkins/workspace/imhotep/imhotep/imhotep/main.py", line 54, in main
    imhotep.invoke()
  File "/mnt/services/jenkins/workspace/imhotep/imhotep/imhotep/app.py", line 135, in invoke
    x, pos_map[x], violations['%s' % x])
TypeError: report_line() takes exactly 7 arguments (6 given)

Here are the signatures before and after the changes:

Let me know if I misunderstood. Thanks!

[codecov-io]

Current coverage is 97.70% (diff: 100%)

No coverage report found for master at dfe618d.

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[justinabrahms]

Thanks so much!

[harveyr]

D'oh! I need to fix the interpolation in PrintingReporter.report_line as well. I'll try to PR that first thing tomorrow.