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 metadata updates from upstream r563
Generated Python files for metadata
Add discussion of exceptions to README.md
Use correct order of parameters; fixes #17
Merge metadata updates from upstream r574
Generated Python files for metadata
Merge code changes from upstream r574
Add test to restore 100% coverage
Update Python3 instructions
Prep for 5.5 release
Merge branch 'dev' into python3

Conflicts:
	python/phonenumbers/data/alt_format_49.py
	python/phonenumbers/data/region_BR.py
	python/phonenumbers/data/region_CD.py
	python/phonenumbers/data/region_CN.py
	python/phonenumbers/data/region_CR.py
	python/phonenumbers/data/region_DE.py
	python/phonenumbers/data/region_GA.py
	python/phonenumbers/data/region_GN.py
	python/phonenumbers/data/region_IR.py
	python/phonenumbers/data/region_KR.py
	python/phonenumbers/data/region_MM.py
	python/phonenumbers/data/region_PF.py
	python/phonenumbers/data/region_PH.py
	python/phonenumbers/data/region_SA.py
	python/phonenumbers/data/region_UA.py
	python/phonenumbers/data/region_UG.py
	python/phonenumbers/data/region_ZW.py
	python/phonenumbers/geodata/__init__.py
	python/phonenumbers/phonenumberutil.py
	tools/python/README