Load Composer's autoloader if exists.

Very tricky, very ugly, but we have no choice for now.
Merge branch 'incoming'
[auto] Merge from Core

    • #1b8475f — Load Composer's autoloader if exists. (Ivan Enderlin, 2014-01-25)
    • #61194ee — Merge branch 'incoming' (Ivan Enderlin, 2014-01-25)

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Merge branch 'master' of /var/lib/git/repositories/Library/Core