Feat: Add a config file to be able to ignore rules project-wide

[gmuloc]

cf: #53 (comment)

[wesley-dean]

Could one do something like this:

find -name '*.j2' -exec sh -c 'echo "$(cat j2lintrc) -- {}" | xargs -n99  j2lint ' \;

where j2lintrc would have lines like:

--flag
--flag2=\"foo\"
--flag3 \"foo bar bazzle\"
-f

which would result in:

j2lint --flag1 --flag2="foo" --flag3 "foo bar bazzle" -f -- ./test/bad.j2
j2lint --flag1 --flag2="foo" --flag3 "foo bar bazzle" -f -- ./test/good.j2

That is, as a work-around, could someone wrap j2lint?

It wouldn't be a long-term solution, but at least it would give folks something they could do before such functionality is incorporated into the tool (if ever)