Converted speaker-info design into a template

The speaker info page was designed to be copied,
i translated it into a template and inserted template
points so that the speaker pages are literally just metadata.
In the coming commits I will be standardizing any speaker file reference
to be first_second.meta.format (eg. daniel_fiske.large.jpg for images)
so that we can reference everything using the meta data
Moved speakers into metadata

Created site metadata for our listed speakers to be referenced on
multiple pages. This data is used to populate lists of speakers on the
speakers and speaker info pages. I also moved images into a standard
format to couple with previous commit.
Changed metadata to use full name instead of name and surname

I found out that Jekyll has template filters to replace text and
so its cleaner to use those than to split the persons name up
when constructing file paths etc.
Moved sponsor-info into template and updated sponsors

Same as was done for speakers. Moved sponsor information into yaml and updated
the design pages to be templates. Sponsors will use the same image file
path as speakers (name.meta.format). There is also a list of the
sponsors in the main site metadata for use on the sponsors and
sponsor-info pages.
replaced tabs with spaces in css
Made the width of the headings on the speaker and sponsor info pages wider
removed old speakers info page (file)
Merge branch 'scaleconf2013' into gh-pages