Updating docs with optional `context` arg for a few methods.
`groupBy`, `countBy` and `sortedIndex` can all take an optional
`context` argument, but this wasn't in the docs.
Merge pull request #947 from lukeasrodgers/add_context_param_to_docs

Updating docs with optional `context` arg for a few methods.
Add raw/ to .npmignore
Merge pull request #953 from caseywebdev/master

Add raw/ to .npmignore
Add evaluate = false to the uglify build
Fixes #936 -- adds a findWhere function
Simplifying _.bind to remove ES5 edge cases
Fixes #474 -- add _.partial
Underscore.js 1.4.4
more consistently return undefined instead of null.
Fixed the Rakefile to include the license in minified builds.
Removing the ability for bindAll to be called with no arguments. White-listing the function names to be bound is always a better option.
added a few more test cases
_.defaults only overrides `undefined` values
Merge pull request #970 from caseywebdev/defaults

_.defaults only overrides `undefined` values
Merge pull request #964 from clottes/contrib

added a few more test cases
removed undefined bit
Fixes #968 -- warn about numeric length up top
Make groupBy accept array indices as the iterator

Background
---
We're using a data format that looks like this:

    [['type1', 1234], ['type2', 4321], ...]

I want to group that data by the first element in each sub array.

Why it didn't work
---
Because the iterator defaulted to `_.identity` if the given iterator was
falsy it worked fine with integers != 0 so for example `_.groupBy(data, 1)`
worked fine but `_.groupBy(data, 0)` didn't.

The fix
---
I simply changed so that the iterator is only set to the default value
if the given one is `null` or `undefined`.

Tests
---
I added two simple tests that group a multi dimensional array using 0
and 1 as the iterator.

Backwards compatibility
---
This, of course, breaks backward compatibility but I doubt that anyone
relied on this behaviour.

Discussion
---
I think this solution is better than having to cast the integer to a
string seeing as that is "wrong" (array indices are integers, not
strings), please let me know if you disagree.
Merge pull request #974 from ansman/master

Make groupBy accept array indices as the iterator