Fix #19: ResourceWarning on test_encoding (test_big5.txt unclosed)
Fix #19: ResourceWarning on test_encoding (test_big5.txt unclosed)

mgilson/html5lib-python,mindw/html5lib-python,ordbogen/html5lib-python,dstufft/html5lib-python,html5lib/html5lib-python,alex/html5lib-python,alex/html5lib-python,mindw/html5lib-python,gsnedders/html5lib-python,mgilson/html5lib-python,dstufft/html5lib-python,gsnedders/html5lib-python,mgilson/html5lib-python,html5lib/html5lib-python,ordbogen/html5lib-python,mindw/html5lib-python,dstufft/html5lib-python,alex/html5lib-python,html5lib/html5lib-python,ordbogen/html5lib-python