Added if statement to resolve which package manager to use.
Print message to stderr.
~README.md Added singleton entry.
~installer.sh Now executable.
Merge branch 'installer'
+valid_ipv4.pl Perl script that checks if input is a valid IPv4 address.
~installer.sh Added tabs to lang_pack.
~common.h Replaced int typedefs with <stdint.h>
~README.md Added vali_ipv4.pl
Merge branch 'master' into GUI_Scheduler