Updated sponsor tableview to show images
Launch safari when selecting a sponsor
fixed cell size on sponsors tableview
Updated sponsors tableview cell
Merge branch 'master' of https://github.com/TEDxCT/tedx_ios

# By Victor Kirov
# Via Victor Kirov
* 'master' of https://github.com/TEDxCT/tedx_ios:
  Added genre to agenda screen and increased height of talk cells Fixed icon and genre styling in talk screen