[#247] update validations

Conflicts:
	app/models/product_build_list.rb
[#247] fix model specs
[#247] add some api specs
[#247] fix build list spec
Merge pull request #441 from abf/rosa-build:247-update_validations
 #247 update validations
update a access rights for creation/build of build_lists
Merge branch 'master' into improvements-of-security
add maintainer to the project partial
[#247] add string/text maximum length validations
Merge pull request #442 from abf/rosa-build:247-validations
 set a maximum attributes length
[#247] fix validation mistype