Some niceties for _.sample.

* Use consistent args check.
* Handle objects in the single value path.
Add favicon to test/index.html
Merge pull request #1283 from braddunbar/icon

Add favicon to test/index.html
No need to be clever.
Use _.values for sampling objects.
Merge pull request #1282 from braddunbar/sample

Some niceties for _.sample.
remove Rakefile in favor of npm scripts
Merge pull request #1287 from akre54/remove-rakefile

Remove Rakefile in favor of npm scripts
Use _.identity in _.sortBy if iterator is not specified
Tabs -> spaces, equal -> strictEqual.
Use the faster Date.now if available.
Merge pull request #1296 from smelnikov/master

Use the faster Date.now if available.
trailing whitespace
add link to the Python toolz project
_.wrap via _.partial
add diff, docs, and date links to the changelog
Merge pull request #1324 from akre54/docs-links

Add diff, docs, and date links to the changelog
Fixed memory leak with throttle arguments
Merge pull request #1329 from jayphelps/patch-1

_.throttle memory leak fix
Fixed memory leak with debounce arguments