FYI about upcoming changes: detectron package

[rbgirshick]

Next Monday, we plan to merge a big diff that will place most of the Detectron code under a directory named detectron. This change will place Detectron's library code into a Python package named detectron and will help users avoid namespace collisions for common module names (like utils) when installing Detectron system-wide (addressing #228). Unfortunately this change will be somewhat disruptive for people who have built on top of or modified custom forks of the code. For the most part, if you rebase your code you will only need to change imports like:

from core.config import cfg

to

from detectron.core.config import cfg

reflecting the new directory structure:

Detectron
|_ cmake/
|_ CMakeLists.txt
|_ configs/
|_ CONTRIBUTING.md
|_ demo/
|_ detectron/
|   |_ core
|   |_ datasets
|   |_ modeling
|   |_ ops
|   |_ roi_data
|   |_ tests
|   |_ utils
|_ docker/
|_ FAQ.md
|_ GETTING_STARTED.md
|_ .github
|_ .gitignore
|_ INSTALL.md
|_ LICENSE
|_ Makefile
|_ MODEL_ZOO.md
|_ NOTICE
|_ README.md
|_ setup.py
|_ tools/

We may expect some bugs right after the merge, so please let us know if there are any issues. Thanks!