add gemnasium badge
update dependencies
minitest -> rspec
add mutant gem
improve instagram_client specs
improve Post specs
raise if empty uniq_attrs in builders
Merge branch 'feature/add_mutation_tests' into develop
enable coverage in travis-ci
ruby 2.1.1=> 2.1.4
change raise syntax
add rake db tasks
fix travis-ci migration
update gems + binstub
Merge branch 'feature/db_rake_tasks' into develop
update sidekiq + redis-namespace
Merge branch 'release/v0.2.1'