Update Httparty to ~> 0.13.0 to avoid CVE-2013-1802

Also updates gems
Adds `set :protection, :except => :path_traversal` to app.rb

This prevents eating/omission of %2F%2F when called from spec/requests/magickly_app_spec.rb:114

More information: https://github.com/sinatra/sinatra/issues/808
remove unused tasks from rakefile
lock activesupport version
check response status in tests explicitly
Merge branch 'master' of github.com:ad-dc/magickly into lock-activesupport

Conflicts:
	Gemfile.lock
	magickly.gemspec
use fastimage instead of imagesize gem
drop support for ruby 1.8.7 and 1.9.2
Merge pull request #32 from afeld/lock-activesupport

drop support for Ruby 1.8.7 and 1.9.2
move version into constant
remove HISTORY file

using releases page instead
https://github.com/afeld/magickly/releases
bump to 2.0.0
fix require-ing of version file from gemspec
Merge pull request #33 from afeld/2-x

2.0 release