Added new section on floating point arithmetic
Edited the list of objectives
Incorporated changes suggested by @gvwilson
Added explicit exposition on half-open nature of list indexes
extended python function lesson
- real life example for function stacks
- default parameter ordering
- why functions aid maintenance
typo
Added link to documentation on lists
typos: python -> Python
Formated variable names properly
removed typos
fixed formatting errors
Incorporated changes suggested by @wltrimbl, @mattphotonman and @ahmadia
Spell fixes for expanded functions-modules
Transfered expanded function-definition exposition
Added example multi-line indented block
Spelling and markup
More code markup
Merge pull request #77 from DamienIrving/floating_point_arthmetic

Floating point arthmetic
Merge pull request #104 from phillies/py-func-jpl

extended python function lesson
Remove git lesson mistakenly attributed to The Hacker Within.
Add Matt's original git and GitHub lesson notes.