Upgrade LyX to v2.1.1

Would prefer it if the .sig files was also verified against, see #164.
ftp://ftp.lyx.org/pub/lyx/bin/2.1.1/
ftp://ftp.lyx.org/pub/lyx/bin/2.1.1/LyX-2.1.1+qt4-i386-carbon.dmg
ftp://ftp.lyx.org/pub/lyx/bin/2.1.1/LyX-2.1.1+qt4-i386-carbon.dmg.sig