Integrate wtfapp-devenv

[gmacario]

• [x] Do git filter-branch gmacario/wtf-docs/wtfapp-devenv
• [ ] Create one branch for each supported Android SDK version
• [ ] In repo gmacario/wtf-docs, replace subdirectory with a git submodule

[gmacario]

Merging subdirectory wtfapp-devenv of https://github.com/gmacario/wtf-docs

References:

• https://github.com/gmacario/android-devenv
• https://github.com/gmacario/wtf-docs
• https://help.github.com/articles/splitting-a-subfolder-out-into-a-new-repository/

Logged as gmacario@kruk

$ git clone https://github.com/gmacario/wtf-docs android-devenv2
$ cd android-devenv2
$ git filter-branch \
  --prune-empty \
  --subdirectory-filter wtfapp-devenv \
  master
$ git remote add origin2 https://github.com/gmacario/android-devenv
$ git fetch --all --prune
$ git merge origin2 master
  (manually fix conflicts)
$ git push -u origin2 master