add method for gaining operator privileges

Closes gh-73
Merge branch 'feature/bot_oper'
Merge branch 'maint'
Update examples/plugins/own_events.rb
Revert "remove User#attr because it only calls super"

This reverts commit 2e507982f4ede4079e28c10823f540c06e9c2a64.
Merge branch 'maint'
when receiving a nick change for the bot, change the Bot instance, not a User instance
Merge branch 'maint'
set @monitored_timer correctly
Merge branch 'maint'
correct documentation of :method option for Plugin::ClassMethods#hook
Merge pull request #83 from oz/patch-1

Update examples/plugins/own_events.rb
use isupport information to check if message target is channel
Merge branch 'maint'
Merge branch 'master' of github.com:cinchrb/cinch
add delay_joins to list of known bot options
fix join_handler on signals
bump version to 2.0.3
Merge branch 'maint'
Do not break when calling User#unmonitor before having called User#monitor

On networks without MONITOR support, User#unmonitor was
unconditionally stopping the monitor timer, even if none existed.