New options: defaultErrors and deferHelpers

> defaultErrors: {Boolean} [default=false]

Whether requirejs default error handler should be left untouched, ie
no custom require.onError handler should be installed.

> deferHelpers: {Boolean} [default=false]

When true, the specified helper scripts will be injected _after_
requirejs has been configured. This works around issues that come up
with you try to require() a script inside one of the helpers, using
either a pre-defined module name, or a full path, and then you get
errors similar to:

`Error: scripterror: Illegal path or script error`

Setting `deferHelpers` to true will make sure that the helpers will be
loaded only after require.js has been configured with your custom paths
and shims.
Bump version to 0.1.9