bumping to 2.0.1
* ext/psych/yaml/yaml.h: [DOC] fix typo by @GreenGeorge [Fixes GH-161]
  https://github.com/tenderlove/psych/pull/161
[#163] Add license to gemspec, is MIT
Merge pull request #164 from bf4/add_license_to_gemspec

[#163] Add license to gemspec, is Ruby
Merge branch 'master' of github.com:tenderlove/psych

* 'master' of github.com:tenderlove/psych:
  [#163] Add license to gemspec, is MIT
  * ext/psych/yaml/yaml.h: [DOC] fix typo by @GreenGeorge [Fixes GH-161]   https://github.com/tenderlove/psych/pull/161
* ext/psych/lib/psych/visitors/yaml_tree.rb: string subclasses should
  not be considered to be binary.  Fixes Psych / GH 166
  https://github.com/tenderlove/psych/issues/166

* test/psych/test_string.rb: test for fix

Fixes #166
* ext/psych/lib/psych/visitors/yaml_tree.rb: make less garbage when
  testing if a string is binary.
* ext/psych/lib/psych/visitors/to_ruby.rb: process merge keys before
  reviving objects. Fixes GH psych #168
* test/psych/test_merge_keys.rb: test for change
  https://github.com/tenderlove/psych/issues/168

Fixes #169
fix regexp for matching TIME.

fixes #171
fix support for negative years.

Fixes #168
bumping version
Enable YAML serialization of Ruby delegators and simple delegators