Fix API docs, fixes #72. Experiment with coveralls

.travis.yml

@@ -1,3 +1,7 @@
 language: node_js
 node_js:
   - 0.10
+script:
+ - npm install
+ - npm test
+ - npm run cov

API.md

@@ -83,12 +83,12 @@ as one-dimensional arrays of more than one number each.
 Produces [sample variance](http://mathworld.wolfram.com/SampleVariance.html)
 of a single-dimensional array of numbers.
 
-### .sample_covariance(x)
+### .sample_covariance(a, b)
 
 Produces [sample covariance](http://en.wikipedia.org/wiki/Sample_mean_and_sample_covariance)
 of two single-dimensional arrays of numbers.
 
-### .sample_correlation(x)
+### .sample_correlation(a, b)
 
 Produces [sample correlation](http://en.wikipedia.org/wiki/Correlation_and_dependence)
 of two single-dimensional arrays of numbers.

README.md

@@ -33,6 +33,12 @@ Mean of a single-dimensional Array of numbers. _Also available as `.average(x)`_
 
 Sum of a single-dimensional Array of numbers.
 
+### .mode(x)
+
+Returns the number that appears most frequently in a single-dimensional Array
+of numbers. If there are multiple modes, the one that appears last
+is returned.
+
 ### .variance(x)
 
 [Variance](http://en.wikipedia.org/wiki/Variance) of a single-dimensional Array of numbers.
@@ -88,12 +94,12 @@ as one-dimensional arrays of more than one number each.
 Produces [sample variance](http://mathworld.wolfram.com/SampleVariance.html)
 of a single-dimensional array of numbers.
 
-### .sample_covariance(x)
+### .sample_covariance(a, b)
 
 Produces [sample covariance](http://en.wikipedia.org/wiki/Sample_mean_and_sample_covariance)
 of two single-dimensional arrays of numbers.
 
-### .sample_correlation(x)
+### .sample_correlation(a, b)
 
 Produces [sample correlation](http://en.wikipedia.org/wiki/Correlation_and_dependence)
 of two single-dimensional arrays of numbers.

package.json

@@ -11,10 +11,13 @@
   "devDependencies": {
     "mocha": "1.17.x",
     "chai": "1.9.x",
-    "jshint": "2.4.4"
+    "jshint": "2.4.4",
+    "mocha-lcov-reporter": "0.0.1",
+    "coveralls": "~2.10.0"
   },
   "scripts": {
     "test": "jshint src/*.js && mocha -R spec test/spec",
+    "cov": "istanbul cover node_modules/.bin/_mocha --report lcovonly test/spec && coveralls < ./coverage/lcov.info",
     "api": "node api.js"
   },
   "main": "src/simple_statistics.js",