Update twitter config and data provider.

Problem/Motivation

I get a problem when I whant to use the twitter config to import my post from twitter.
The field set in form to configure the twitter information force to pass by a oauth protocole.
but the twitter api allow user to set instead of "tw_access_token" and "tw_access_token_secret" only a "tw_access_token_secret" consider by the API as a bearer token.

In the mean time it appears th module force to get post from one route but the twitter API documentation allow consummers to get post from 3 route :

statuses/home_timeline
statuses/mentions_timeline
statuses/user_timeline

For the first two routes, the elements needed are some but for the last one you need to specify the user name.
so a field additional to set a name was need.

Proposed resolution

For the first two routes, the elements needed are some but for the last one you need to specify the user name.
so a field additional to set a name was need.

Remaining tasks

User interface changes

A new radios type field appears to select the route to consumming.
A new textfield field is adding to set name form route user timeline.
The field "tw_access_token" is no longer required. To allow user to set a bearer token in "tw_access_token_secret" field.

API changes

Data model changes