fix for #122 jshint warnings

fix for #122. only two issues remain:

```
numbers.js/lib/numbers/basic.js
  line 124  col 23  Did you mean to return a conditional instead of an assignment?

   1 warning

numbers.js/lib/numbers/matrix.js
  line 51  col 36  Expected a conditional expression and instead saw an assignment.

   1 warning
```

everything else is taken care of.

cc @LarryBattle