Merge pull request #9 from otternq/development

Implementing socket.io with invasion example
Merge pull request #10 from otternq/development

Added socket.io include
Merge pull request #11 from otternq/dev-map

Modified PlayerEntity.update()
Merge pull request #19 from otternq/development

Development
Merge pull request #21 from otternq/development

Development
Merge pull request #39 from otternq/development

Development
Merge pull request #50 from otternq/development

Development
re-enabling heroku socket settings
re-enabling asteroid resize and audio