Make travis/jenkins check for lint on files which are clean to start with

scripts/generate-eslint-error-ignore-file

@@ -0,0 +1,21 @@
+#!/bin/sh
+#
+# generates .eslintignore.errorfiles to list the files which have errors in,
+# so that they can be ignored in future automated linting.
+
+out=.eslintignore.errorfiles
+
+cd `dirname $0`/..
+
+echo "generating $out"
+
+{
+    cat <<EOF
+# autogenerated file: run scripts/generate-eslint-error-ignore-file to update.
+
+EOF
+    
+    ./node_modules/.bin/eslint --no-ignore -f json src test |
+        jq -r '.[] | select((.errorCount + .warningCount) > 0) | .filePath' |
+        sed -e 's/.*matrix-react-sdk\///';
+} > "$out"

scripts/travis.sh

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+#!/bin/sh
+
+set -ex
+
+npm run test
+./.travis-test-riot.sh
+
+# run the linter, but exclude any files known to have errors or warnings.
+./node_modules/.bin/eslint --max-warnings 0 \
+    --ignore-path .eslintignore.errorfiles \
+    src test