Helsinki: Add new sponsors

Gofore and Sysart.
Merge pull request #1299 from jyrkiput/sponsors_sysart_gofore

Helsinki: Add new sponsors
Added Citrix as Bronze sponsor
Resolve merge conflict
Merge pull request #1300 from tolomaus/master

Added Citrix as Bronze sponsor
Merge pull request #1301 from DevOpsDaysChicago/master

Chicago Ignite schedule adjustment
Helsinki: Change logo for sponsor

Update as requested. Changing name of logo file to avoid potential
cache issues.
Merge pull request #1302 from jyrkiput/update-cybercom-logo

Helsinki: Change logo for sponsor
Helsinki: Resize and add borders to logos

310x310px size, 5 pixel border with color #1481ab
Add GIMP -workfile of logos

The workfile has every logo as layer.
Remove old logos

These are randomly sized and without borders.
Helsinki: Proposal Lean, Agile Development and tools for Portfolio management
Helsinki: New suggestion for topic
Merge pull request #1304 from jyrkiput/new-proposals

New proposals for Helsinki
Merge pull request #1303 from jyrkiput/borders-to-logos

Borders to logos
Update TLV venue
Update TLV venue
Update TLV venue
RIP MONGODB
Merge pull request #1305 from DevOpsDaysChicago/master

Chicago Program and OpenSpace