Merge pull request #2 from clarencecastillo/master

Refactored dose as an importable module
Merge pull request #3 from clarencecastillo/master

Updated dose.py and SIM_01.py
1. Re-arranged files into directories for installation. 2. Added examples/run_examples_without_installation.py to enable execution of example simulations without the need to install DOSE
Merge pull request #2 from mauriceling/master

 	1. Re-arranged files into directories for installation. 2. Added examples/run_examples_without_installation.py to enable execution of example simulations without the need to install DOSE