Set UTC as rufus timezone fallback and add tzinfo-data gem

Author: hkdsun

appveyor.yml

@@ -5,6 +5,7 @@ environment:
   RUBYOPT: '-W0'
   COVERAGE: 1
   JRUBY_OPTS: ''
+  TZ: 'UTC'
 
 install:
 - set PATH=C:\Ruby23\bin;%PATH%

resque-scheduler.gemspec

@@ -47,6 +47,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency 'simplecov'
   spec.add_development_dependency 'test-unit'
   spec.add_development_dependency 'yard'
+  spec.add_development_dependency 'tzinfo-data'
 
   # We pin rubocop because new cops have a tendency to result in false-y
   # positives for new contributors, which is not a nice experience.