Merge pull request #30 from x3igh7/production

assets
Merge pull request #31 from x3igh7/production

Production
Merge pull request #32 from x3igh7/production

Production
Merge pull request #33 from x3igh7/production

fixes to gravatar default images
Merge branch 'dev' into production
resolved some remaining issues with admin match editting
added select2 gem, tournament_admin table and basic model tests