Import new AnacondaSetPythonInterpreter class

AnacondaSetPythonInterpreter is present in __all__ list but not imported.

This is causing the plugin to not load correctly.

Error in Sublime console:

reloading plugin Anaconda.anaconda
Persisten list does not exists, skiping load...
Traceback (most recent call last):
  File "/Applications/Sublime Text.app/Contents/MacOS/sublime_plugin.py", line 73, in reload_plugin
    m = importlib.import_module(modulename)
  File "X/importlib/__init__.py", line 88, in import_module
  File "<frozen importlib._bootstrap>", line 1577, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1558, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1525, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 586, in _check_name_wrapper
  File "<frozen importlib._bootstrap>", line 1023, in load_module
  File "<frozen importlib._bootstrap>", line 1004, in load_module
  File "<frozen importlib._bootstrap>", line 562, in module_for_loader_wrapper
  File "<frozen importlib._bootstrap>", line 869, in _load_module
  File "<frozen importlib._bootstrap>", line 313, in _call_with_frames_removed
  File "/Users/hustoi/Library/Application Support/Sublime Text 3/Packages/Anaconda/anaconda.py", line 19, in <module>
    from .commands import *
AttributeError: 'module' object has no attribute 'AnacondaSetPythonInterpreter'