Merge pull request #43 from dozeo/fix/grabsend_deployment

Fixes installation of grabsend executable
Merge pull request #44 from dozeo/fix/grabsend_deployment

Deployment of grabsend differs on Win/OSX
added zlib as a build dependency on windows
use dozeo zlib fork
removed external zlib dependency to setup internal one
remove dependency on external zlib project
updated dozeo/zlib to exclude artifacts generated by Makefile.gcc
modify commit to x264 that screengrabber depends on to reflect custom fix for windows header change; add check for forgotten submodule update on build dependencies
attempt to remove completely incorrect dependencies
hopefully fixed x264 dependency to use correct github repo and commit
re-added the zlib -> dozeo fork as dependency
removed dependency on external ffmpeg repo
re-added dependency on ffmpeg -> dozeo fork on branch with windows header fix
update project to use latest ffmpeg + x264 (subprojects not updated in this change yet)
Merge remote-tracking branch 'origin/dozeo-zlib' into new_build_process
small update on submodules (ffmpeg, x264)
fixed ffmpeg dependency
updated polarssl ref to the latest master
fixed ref to zlib commit
got rid of rtmpdump as a submodule