Ability to export sessions

[jak78]

Being able to export sessions in a spreadsheet-friendly format would help event organizers to:

• publish the schedule
• print the schedule
• manage speakers data - like how to recontact them and so on

Here is my 'specification' proposal:

One session = one line
If a session has several speakers, then several lines are exported - duplicated lines for the same session, one line by speaker
Exported columns:

• speaker last name
• speaker surname
• speaker company
• speaker bio
• speaker email address
• speaker phone number
• (every other speaker data)
• session title
• difficulty
• track
• format name
• format duration in minutes
• description
• date
• mean
• votes

Exported format: CSV, UTF-8, Unix our Windows line feeds (does not matter)

[ndeloof]

proposal REST API should be ok for this, but we definitively want to expose all required flavor to make integration easier