switched to rspec2, replaced jeweler with bundler for gem building
remove Gemfile.lock
Merge branch 'master' of git://github.com/langalex/postmark-rails into langalex-master

Conflicts:
	.gitignore
Include README.rdoc, there is no README.md so far.
Require rspec >= 2.7.
Shorten the spec_helper requirement syntax.