[irc] Only split args with spaces, fixes #406

Prevents the default .split() from catching Unicode whitespace
same with the other .split()
Merge pull request #411 from bui/patch-2

[irc] Only split args with spaces, fixes #406
Fix #415 by ignoring all future arguments if first is a digit.
Added __repr__ for Nick class. Resolves #413 somewhat.
[various modules] Utilize Trigger.is_privmsg

Replace trigger.sender.startswith('#') checks with trigger.is_privmsg
in the following modules: admin, find, meetbot, reload, seen.
Merge pull request #417 from flyte/hotfix/nick-repr

Added __repr__ for Nick class. Resolves #413 somewhat.
Merge pull request #425 from Ohcanep/feature/is_privmsg

[various modules] Utilize Trigger.is_privmsg