Feature Request: Syslog disabling using ENV var

[olleolleolle]

Hello!

I'm trying to support someone who's using tokenizer, which logs.

They're on a platform without Syslog support, and they reach the part of core which does Syslog access.

Perhaps they could set an ENV var, like:

• ENABLE_SYSLOG=false
• ENABLE_SYSLOG=no
• ENABLE_SYSLOG=off
• ENABLE_SYSLOG=0

But the code in this line: https://github.com/opener-project/core/blob/master/lib/opener/core/syslog.rb#L13 seems to expect "the empty string" to be false. (The empty string is not false in Ruby.)

Example, showing an "empty JUSTTESTING" environment variable to be "the empty string":

JUSTTESTING= ruby -e 'puts ENV.inspect'