Hold log file in the project root.

This fix an issue if user install package and turn on debug flag.
Simply log directory doesn't exists in the elpa package folder.
So anaconda-mode will fail in debug mode.
Consider python dependencies installed in project root.

Emacs package must has following structure to work properly:

jedi/
click/
jsonrpc/
anaconda-mode.el
anaconda_mode.py
Use default provision for Travis CI.