Fix non-raw strings containing escape characters #13
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This fixes python warnings about invalid escape sequences. Check the change to CODE_WITH_OUTPUT in from_notebook.py; I am not certain that that is what is intended. Also, changing the strings in test_builders.py and test_codelinks.py to raw strings unfortunately required removing the initial line-ending escape, which makes the code a little less pretty. The alternative is to leave them as non-raw strings and double the other escape characters.