Mention on-demand metadata loading in HISTORY
Prep for 5.4 release
Merge metadata updates from upstream r557
Generated Python files for metadata
Merge code changes from upstream r557
Merge metadata updates from upstream r562
Generated Python files for metadata
Merge branch 'dev' into python3

Conflicts:
	python/phonenumbers/data/region_CD.py
	python/phonenumbers/data/region_CN.py
	python/phonenumbers/data/region_GN.py
	python/phonenumbers/data/region_IR.py
	python/phonenumbers/data/region_PF.py
	python/phonenumbers/data/region_UG.py
	python/phonenumbers/data/region_ZW.py
	python/phonenumbers/geodata/__init__.py
	python/phonenumbers/phonenumberutil.py