Modification to Slideshare

- mui library now returns the full HTML link provided by SlideShare,
including author's name and links
- Slideshare view now uses full HTML link provided instead of inserting
only the id in a pre-set embed frame
- materials table modified for larger field to accommodate longer HTML
link
- skilljoy database with old slideshare content format removed and with
the new modified materials table
Re-exported skilljoy.sql
Changed column type to text

- changed material table content column type to TEXT to accommodate
longer HTML results
Merge pull request #12 from m-mmoocs/Slideshare-Metadata

Modification to Slideshare