Bring dev.README up to date

 - Testing is with py.test
 - Installation modes
 - Dev/release process

Version: 2014.1116.5
Clean and install tweaks in Makefile

 - Update clean target to remove __pycache__
 - Add target user_install for --user installs

Version: 2014.1116.6
Test tweaks

 - remove coverage warning from test outputs
 - test_align: expected is a function name, not a variable
 - test_ascii: adjusting spaces in expected ascii output
 - test_gtx: use unexpected_in() rather than assert() for automated message
 - testhelp: make spaces visible when comparing strings in assertEq

Version: 2014.1116.7