Replace old logo with new squid to resolve #599 (3rd time lucky).
Using squid logo URL taken from balderdashy/sails-mongo, in keeping with other sails repos: balderdashy/sails-postgresql, balderdashy/sails-mysql, balderdashy/waterline, etc.
Merge pull request #637 from DuncanMacWeb/development

Replace old logo with new squid to resolve #599