Add do-not-panic! regression tests

tests/examples/regression_tests/issue_190.md

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+```javascript
+var test = "boom";
+```

tests/examples/regression_tests/issue_28.md

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+Test
+
+<div>
+</div>

tests/examples/regression_tests/issue_314.hs

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+module Main where
+
+main :: IO ()
+main = putStrLn "Please show my file :c"

tests/examples/regression_tests/issue_914.rb

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+<<END_DESC
+Test
+END_DESC

tests/examples/regression_tests/issue_915.vue

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+<style lang="stylus">
+</style>