Correct NumPy references and whitespace error
Merge branch 'develop' into Matplotlib
Fixed references withing the text, as well as spelling
Semantic fixes
A few brief grammatical edits
Edited writing and organization
Edited section 'Learning Python'
fixed some formatting and capitalization
replaced some lab text with external readings
made minor edits
revised as per suggestions
fixed while loop example
fixed some last small things.
Merge branch 'develop' into Matplotlib
Grammatical edits, replaced unnecessary tables with links to documentation
Fixed inconsistencies between prior versions and the current approach
Merge pull request #697 from aamcbee/FinalDataStructures

Fixed inconsistencies between prior versions and the current approach
Merge pull request #690 from aamcbee/Matplotlib

Matplotlib
Merge pull request #685 from rachelwebb/rachel

Rachel