Use utf8 encoding for strings

Change-Id: I45e2fea7f37978beb6c8572fc5e7c3056e586b75
Add the plugin

Change-Id: If494c38dcb248c6d117c0abc409a03d8a566d72b
Add protoc cpp and protoc descriptor generators for scons

Change-Id: I73fd7451e96e49674b11d55c144d3aaca856c37e
readme file