Update to genuine 0.8.0

• Change MASTER_SITES to CHEESESHOP
• Remove BUILD_DEPENDS
• Fix version requirement of RUN_DEPENDS
• Use SHEBANG_GLOB
• Cosmetic change
• Bump PORTREVISION for package change
• Take maintainership

Changes: https://github.com/statsmodels/statsmodels/releases

		https://github.com/statsmodels/statsmodels/commits/maintenance/0.8.x