refactor(package): explicitly specify files for release tarball

Author: kylef

.npmignore

@@ -27,5 +27,39 @@
     "test:await": "mocha",
     "test": "node --version | grep -q -E \"v(4|6)\" && npm run test:exclude-await || npm run test:await"
   },
+  "files": [
+    "binding.gyp",
+    "src/*.cc",
+    "src/*.h",
+    "drafter/LICENSE",
+    "drafter/common.gypi",
+    "drafter/drafter.gyp",
+    "drafter/src/*.cc",
+    "drafter/src/*.h",
+    "drafter/src/utils/*.cc",
+    "drafter/src/utils/*.h",
+    "drafter/src/utils/so/*.cc",
+    "drafter/src/utils/so/*.h",
+    "drafter/src/utils/log/*.cc",
+    "drafter/src/utils/log/*.h",
+    "drafter/src/refract/*.cc",
+    "drafter/src/refract/*.h",
+    "drafter/src/refract/dsd/*.cc",
+    "drafter/src/refract/dsd/*.h",
+    "drafter/ext/boost_1_66_0/boost",
+    "drafter/ext/snowcrash/src/*.cc",
+    "drafter/ext/snowcrash/src/*.h",
+    "drafter/ext/snowcrash/src/posix/RegexMatch.cc",
+    "drafter/ext/snowcrash/src/win/RegexMatch.cc",
+    "drafter/ext/snowcrash/ext/markdown-parser/src/*.cc",
+    "drafter/ext/snowcrash/ext/markdown-parser/src/*.h",
+    "drafter/ext/snowcrash/ext/markdown-parser/ext/sundown/README.md",
+    "drafter/ext/snowcrash/ext/markdown-parser/ext/sundown/src/*.c",
+    "drafter/ext/snowcrash/ext/markdown-parser/ext/sundown/src/*.h",
+    "drafter/ext/snowcrash/ext/markdown-parser/ext/sundown/html/*.c",
+    "drafter/ext/snowcrash/ext/markdown-parser/ext/sundown/html/*.h",
+    "drafter/ext/variant/LICENSE.md",
+    "drafter/ext/variant/include/mpark/*.hpp"
+  ],
   "license": "MIT"
 }