Text Provider ensure text starts with an uppercase letter

[Antonimo]

Many Languages don't have capital/uppercase letters (like hebrew).
Also I think people that use Faker to fill random data don't really care about that.
I suggest make it optional, so we could do something like this:

class HebrewTextProvider extends \Faker\Provider\Text
{
    protected $ensureTextStartsWithUppercase = false;

[fzaninotto]

Great idea. Would you like to work on a PR for that?

[Antonimo]

just add an if!

[Antonimo]

#528

[fzaninotto]

Fixed by #778