Merge branch 'release-0.6' into develop
readied for further development after v0.6
begin working on accepting arguments
added cli args: stack limiting and init values
improved debug (ramp) function: only floats now
raise appropriate error when popping an empty stack
document --version switch
dramatically improve docs (README.md)
improves --version switch
minor formatting in README.md
README clarification
updated developer notes
0.7 ready for release
Merge branch 'release-0.7'