More-compatible iteration

[chrissrogers]

For those lovely older browsers

Signed-off-by: Christopher Rogers chrissrogers@gmail.com

[pirxpilot]

'lovely older browsers' ;-)
Maybe we should just use something like component/each here. Let me see if I can find anything simple enough.

[pirxpilot]

I thought about it some more and decided against adding pre-ES5 workarounds.
They are trickier to write than it appears (for example: the code in this PR iterates over prototype properties - probably not what we want) and they lock us forever in coding to lowest common denominator.

I did look at couple of existing shims and polyfills, but they either do too much (component/map wants component/to-function) or they do not do enough (Object.keys supported but not Array.map).

es5-shim is the best way to support non ES5 complaint browsers (which these days is just a nice name for IE8). es5-shim did not seem to be component-ized yet so I created es-shims/es5-shim#204 (you can use code42day/es5-shim until it is merged)

OK - this turned out longer than I intended: but we have probably > 10 components that use ES5 only features and I wanted to find a solution for all of them.
Thanks for the PR.

[chrissrogers]

That seems like a good solution for the largest number of components that assume ES5-only. However, my use-case is for a distributable library that must not modify Object prototypes, so the shim is not viable. Thanks for the look.