Makefile: add wget portability variable - $(WGET)
add tertiary fallback for unavailable package files
fix bracketing of wget calls
cleanup after failed download
add package cdn fallback
Makefile: correctly escape urls for amazon services
additional information in the documentation
doc update: add note about using local docs with development version
update package openssl
update package cairo
update package gmp
tools/mxe-activate: really fix gsed with portability variable
Merge pull request #144 from alexkay/master

Update FFmpeg and enable opus support
package opus: fix update macro
package freetype: enable bzip2
package openscenegraph: update to track svn instead of releases
package glib: install gspawn-win32-helper programs
package gd: add jpeg image to test
package gd: add gif image to test
update package libpng