Add MD044 proper-names "Proper names should have the correct capitalization" (fixes #39).

test/proper-names.md

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+# markdownlint test file
+
+Markdownlint is a tool {MD044}
+
+JavaScript is a language
+
+JavaScript is not Java
+
+Nor is it Javascript. {MD044}
+
+markdownlint runs on Node.js via npm
+
+Node is an environment
+
+Install into it with NPM {MD044}
+
+Node.JSX is not a real thing
+
+Nor is nodesjs or NPMI
+
+npm can npm stand npm for npm many npm things
+
+Writing npm is right, but NPM is wrong {MD044}
+
+Get excited about Github! {MD044}
+
+Share code on GitHub via Git
+
+Internet Explorer is a web browser
+
+OTOH, "internet explorer" is a job {MD044}
+
+## node.js instructions {MD044}
+
+Code in `javascript` {MD044}
+
+Execute `via the node.js engine` {MD044}
+
+* Use NPM {MD044}
+
+> Run Markdownlint on your README {MD044}
+
+Upload the code (to github) {MD044}
+
+Link to [github](https://github.com/). {MD044}