Fixed Makefile & small def in boardDraw.h

now build directory is kept and a bin is
contaning executable... maybe need some more
work.
Added an install option and changed the location of the score file

the score file is now stored in the right linux folder:
/home/<user name>/.2048/

in make file you can now install so you can run the game from anywhere in the
file system.

and an uninstall option.

"make install"
"make uninstall"

updated the readme file.
Merge remote-tracking branch 'upstream/master'
removed the exec from repo track
Merged after small commit -see pev commits
Small change in makefile uninstall
Merge branch 'sagidayan-master'