Set sys.argv default to [''] like Python does.
Merge https://github.com/hylang/hy

Conflicts:
	hy/cmdline.py
Fix disassembly, add butlast, profile
Remove profile fn.

https://github.com/hylang/hy/pull/522#issuecomment-35972534
Remove profile export.
Merge https://github.com/hylang/hy

Fix butlast and test for disassemble.

Conflicts:
	hy/core/language.hy
Merge branch 'master' into pr/522