[PATCH] Handle embedded param name in Akamai auth token

[dinkypumpkin]

For at least some embedded content (example below), the Akamai
auth token is returned with "auth=" already prepended, which
get_iplayer doesn't expect and thus duplicates.  The changes in
this commit will handle auth tokens with or without the param
name prepended.

Example:
http://www.bbc.co.uk/learningzone/clips/thermal-imagery-in-the-desert/3204.html
---
 get_iplayer |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

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