(#1273) - create legacy build

don't merge, more a discussion starter

we can create 2 builds, a modern one which includes all the stuff for working on modern browsers, and one that also has the full es6 shim and the websql adapter, size differences are as follows:

![screen shot 2014-03-03 at 8 36 21 am](https://f.cloud.github.com/assets/1128607/2309724/da922ae4-a2d8-11e3-8911-85c368767348.png)