Don't generate default metadata value for MySQL. Closes #16
Merge branch 'master' into mysql-default

Conflicts:
	lib/generators/statesman/active_record_transition_generator.rb
	lib/generators/statesman/migration_generator.rb
Rename #is_mysql? > #mysql?
Merge pull request #19 from gocardless/mysql-default

Don't generate default metadata value for MySQL