Issue #126: RubyZip changed the value they return from a block
Version bump to 3.1.1
Updating docs
Regenerate gemspec for version 3.1.1
Undoing the temporary fix for RubyZip-induced issue; bumping minimal requied RubyZip version to ensure the broken one doesn't get pulled; adding the missing require
Version bump to 3.1.2
Regenerate gemspec for version 3.1.2
Automatically include class methods
Cleaning up relationship code
Further moving relationships to complete object model
Moving closer towards fully automated relationship support
Cleaning up relationship file code
Merge branch 'master' into automatic_defaults

Conflicts:
	lib/rubyXL/objects/relationships.rb