* lang_php/analyze/foundation/graph_code_php.ml: add namespace for defs
* lang_php/analyze/foundation/graph_code_php.ml: very basic namespace support
for uses
* lang_php/analyze/foundation/graph_code_php.ml: estet
* lang_php/analyze/foundation/ast_php_simple.ml: comment
* lang_php/analyze/foundation/graph_code_php.ml: factorize in add_use_edge_inheritance
Merge branch 'master' of github.com:facebook/pfff