Merge branch 'master' into buildfix
Merge branch 'master' into buildfix
Completely remove old lib/include build reqs

rbSFML can also be built on Windows without these directories, so they
serve no purpose. Made SFML_LIB and SFML_INCLUDE environment vars
optional.
Fix test/samples require paths for new SO_DIR
Simplify Windows build instructions, use rake gem
Merge pull request #46 from silverhammermba/buildfix

Update Windows instructions, gem path fixes
Cleaning up some old stuff that shoudl be gone
Had to edit Rakefile to compile

I was getting bugs every time 'rbSFML.hpp' was included, to fix it I had to edit the ext folder on the Rakefile to explicitly show that it was on the current folder.

I know that is just a 'workaround' (that works), but I find important to show it to you guys.

Maybe it run OK on Windows & OSX without this quick fix, but this was the only way I find to compile it on Linux (64x_86x, Fedora 18, RVM Ruby 1.9.3)
Merge pull request #47 from kress95/patch-1

Had to edit Rakefile to compile on Linux