MySQL scripts used hardwired 'master' branch

[cer]

ftgo-application/mysql/Dockerfile

Lines 5 to 7 in 0aff959

	ADD https://raw.githubusercontent.com/eventuate-foundation/eventuate-common/master/mysql/1.initialize-database.sql /docker-entrypoint-initdb.d/template1
	ADD https://raw.githubusercontent.com/eventuate-foundation/eventuate-common/master/mysql/2.initialize-database.sql /docker-entrypoint-initdb.d/template2
	ADD https://raw.githubusercontent.com/eventuate-tram/eventuate-tram-sagas/master/mysql/tram-saga-schema.sql /docker-entrypoint-initdb.d/template3

See #160

Need to be parameterized using versions from gradle.properties