fixed mistake with missing elseif in cmake module
fixed win build after merging mac build changes
reduce ffmpeg info logs
video sending now throws exceptions instead of returning error codes
more errors as exceptions instead of unused error codes
submodule update when get_depedencies
submodule update relative to screengrabber dir
fixed tests as well to compile with the latest changes from error codes to exceptions
Merge pull request #47 from dozeo/new_build_process

many small changes regarding building this and dependency libraries