add linting (and some initial fixes)

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+# last-line-stream 
+
+> A PassThrough stream that keeps track of last line written.
+
+[![Build Status](https://travis-ci.org/jamestalmage/last-line-stream.svg?branch=master)](https://travis-ci.org/jamestalmage/last-line-stream) [![Coverage Status](https://coveralls.io/repos/jamestalmage/last-line-stream/badge.svg?branch=master&service=github)](https://coveralls.io/github/jamestalmage/last-line-stream?branch=master)
+
+
+## Install
+
+```
+$ npm install --save last-line-stream
+```
+
+
+## Usage
+
+```js
+const lastLineStream = require('last-line-stream');
+
+const stream = lastLineStream();
+
+stream.write('foo');
+
+assert(stream.lastLine === 'foo');
+
+stream.write('bar');
+
+assert(stream.lastLine === 'foobar');
+
+stream.write('baz\nquz');
+
+assert(stream.lastLine === 'quz');
+```
+
+
+## API
+
+### lastLineStream([pipeTo])
+
+Returns a new instance of the spying PassThrough stream, 
+
+#### pipeTo
+
+Type: `stream`
+
+If supplied, the new instance will automatically be piped to this stream.
+
+### stream.lastLine
+
+Type: `string`
+
+The last line written out to this stream. The `lastLine` value will grow until the stream sees a newline character (`'\n'`).
+
+## Low Level API
+
+A low-level non-stream based API is available. It has only two methods.
+
+```js
+var createTracker = require('last-line-stream/tracker');
+var tracker = createTracker();
+
+// append some text.
+tracker.update(someString);
+
+// Find the complete last line of all the text appended.
+tracker.lastLine();
+```
+
+## License
+
+MIT © [James Talmage](http://github.com/jamestalmage)