Add after-bury perspective class method
Cosmetic changes on base perspective class
Use after-bury method in code and two perspectives
Cosmetic change on code/two perspectives
Document about arguments for after-bury
Refactor e2wm:dp-two/code-after-bury

Call e2wm:pst-get-wm once and make the code cleaner.
Tweak e2wm:dp-two/code-after-bury

Select main window after burying sub window, rather than going to
some random window.
Fix a name error in pst-after-bury logger
Fix base after-bury when other window showing the buffer
Merge pull request #41 from tkf/bury-method

e2wm:$pst-class に after-bury method を追加