The default sendmail path must contain '-bs' or '-t' flags.

Signed-off-by: Isern Palaus <ipalaus@ipalaus.es>
Merge pull request #2021 from ipalaus/fix/sendmail-config

The default sendmail path must contain '-bs' or '-t' flags.
Merge branch 'develop' of http://github.com/laravel/laravel
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