moved d_*.py and ex_*.py to ./oldfiles/
fixed minor typo
    modified:   README.md
    modified:   README.txt
added announcement and updated README
    modified:   README.md
    modified:   README.txt
    new file:   docs/other/2014-04-17announce.txt
made note on python 2 and python3
in ./docs/sources/installation.rst
moved ex_loopdiagram.py out from ./old_files
working on a HVAC diagram tutorial
fixed a formatting error in HVAC_Tutorial
updated docs
Merge branch 'develop2014-07-06' into temp
updated docs