Added support to run with different mysql/postgresql/h2 and demoDB
Added support to run with different mysql/postgresql/h2 and demoDB

sazgin/elexis-3-core,sazgin/elexis-3-core,elexis/elexis-3-core,sazgin/elexis-3-core,elexis/elexis-3-core,elexis/elexis-3-core,elexis/elexis-3-core,sazgin/elexis-3-core