update package sfml
doc update: add EDITOR to env whitelist for interactive sessions
doc update: add MXE to env whitelist for interactive sessions
doc update: add proxies to env whitelist and re-align unset command
Merge branch 'stable'
Merge pull request #254 from skiltz/master

Update package libvpx
Merge pull request #250 from LBg/patch-1

update package sfml
Merge pull request #1 from mxe/master

	update package sfml