Corrected typos on day0 chapter.
Added subsubsection in 0.0.1 explaining module importing and using help on them
Merge remote branch 'upstream/master'
small typo corrected
Merge remote branch 'upstream/master'
Multiple changes for day0. These include typos, and space formatting issues. The introduction to python section has been reformatted to emphasize the two modes of use in the labs: interactive command line vs writing code in files. Order of subsection has also be altered for clarity. Debugging Python subsection (now subsubsection) is also better integrated visually and in terms of previous examples.
Merged Ramon's suggestions with master branch.