Merge branch 'dev'

* dev:
  upgrade to v0.7.1
  v0.7.1
  close connection on Database __del__
  fix mysqldb
  close cursor after execute sql
  close cursor after execute sql
  stop using @property `count` for selected results
  fix sample link
  set `_in_db` flag to False after instance.destroy
Merge branch 'dev'

* dev:
  move `conn_is_up` as Database's instance method
Merge branch 'dev'

* dev: (113 commits)
  ready for v0.9.0
  fix the ugly decimal in py2.6; That is really a shit, fuck decimal
  add venvpy26 to ignore list
  add sample apps
  update readme
  new themes
  add delete, update for multimodels
  rollback add the joinmodel and `&` syntax; Fix selectresult.inst
  update sample/read/join
  new docs
  update descriptions
  @2014
  fix findall tests
  update .gitignore lists
  fix Model.findall
  rm docs
  rm submodule rux and update submodule plain
  decimal in py2.6
  tests for models
  remove delete and update from multimodels
  ...
fix index L
typoes