Throw error when instantiating unrecognized charts

This explicit error is more instructive than what is currently being
thrown in this case:

    Uncaught TypeError: Cannot read property 'prototype' of undefined
Implement support for Internet Explorer

Ensure that the library and its tests are compatable with IE8 (provided
the d3.js-endorsed "aight.js" library is present), IE9, and IE10.
Update examples to use built source

In addition to being more realistic, this approach isolates the examples
from changes in the structure of the source files.
Release v0.1.2
Add a bower.json definition.
Ignore more files.