return sub query side in expression as (%sql)
method `select` now wont select `primarykey` auto
the 0.3.4 version:rm select_without_primarykey;
new and better docs for v0.3.4
v0.3.4 released
add cases.rst; update doc submodule
typofix in changes for v0.3.4
add cases
add changes link in readme; update version in Readme
the available scope is bigger!
Merge branch 'dev'

* dev:
  the available scope is bigger!
  add changes link in readme; update version in Readme
  add cases
  typofix in changes for v0.3.4
  add cases.rst; update doc submodule
  v0.3.4 released
  new and better docs for v0.3.4
  the 0.3.4 version:rm select_without_primarykey;
  method `select` now wont select `primarykey` auto
  return sub query side in expression as (%sql)