Reorganize spec files

* This step only does the file elimination.
  Compressing all spec/unit/$namespace/$class/$method.rb to =>
  spec/unit/$namespace/$class_spec.rb

* The next step will perform all deduplication.
Compress specs

* Consolidate encoding and require spec helper
* Reformat to describe Namespace { describe '#method' }

Next is to remove all redundant let() definitions
Merge branch 'master' into unite-spec-files
Merge branch 'master' into unite-spec-files
Merge branch 'master' into unite-spec-files
Remove duplicate let statements
Merge pull request #12 from snusnu/unite-spec-files

[WIP] Unite spec files