Support of duplicates removal

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Support of POST /repositories/[name]/indices/optimize

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Support of AG 4.6 - Rfe8881 - Optionally suppress duplicates at commit time

Signed-off-by: Aymeric Brisse <aymeric.brisse@perfect-memory.com>
Merge branch 'upmaster'

Conflicts:
	lib/allegro_graph/repository.rb
Merge pull request #20 from abrisse/master

Add some HTTP protocol entries