Set up new Wildcards section.  Text copied from Pipes and Filters for now.
Removed copied text so that Wildcards section is blank and ready to be filled.
modified _includes/guide-shell/create/lesson.html

starting a subsection on touch

+ added more to the section on touch
+ added back in ls command line example
Put in missing </code>.
Took out the text box Quickly create and modify, and started changing things at that point.
Put ls output on one line.
Changed some text explaining touch command.
Finished changing text about touch.  Have to update the rest of the Creating Things section to be consistent.
Continued modifying section to be consistent with presence of draft_empty.txt file.
rm the draft_empty.txt file as well.
Further improvements to shell example

Changed nano to touch in a few places.

Changed wording of one sentence.
Change in wording.
Added summary bullet point about touch.
Slight change in wording to touch bullet point.
Change in wording last modification time --> time of last modification.
Added ls file* example in Wildcard lesson.
Added in examples with {} and ? wildcards.
Added negation wildcard example.
added objectives and text to wildcard lesson
Put ls file?.txt and ls file??.txt example into a separate code box.
added more text to wildcard/lesson
added more text to wildcard/lesson
added keypoints text to wildcard/lesson
Added text on ! wildcard and combining and nesting wildcards.
Started writing about escaping wildcard characters.
Moved explanation of escaping special characters into a box.
Code creating the file file[AB].txt.
More on ls file[AB].txt.
What happens if we create fileA.txt.
Example of escaping wildcard characters.
Changed starter text for Escaping Special Characters box.
Moved wildcard stuff in Pipelines section to Wildcard section.
  Needs to be merged into that text.
Moved all material on wildcards from Pipes and Filters into Wildcards
section, including from objectives and summary, but kept that text in
italics so we can merge it into surrounding text.

Small modification to text at beginning of Pipes and Filters.
Change of wording to text at beginning of Pipes and Filters.
Starting revising text at the beginning of Wildcards section.
Continued writing about file* example.
Moved stuff about asterisk into a box.
Finished text box on asterisk wildcard.
Put four types of wildcards into a bulleted list.
Edited bullet point about square brackets.
Edited bullet point about exclamation mark.
Edited bullet point about curly braces.
Eliminated box on question mark wildcard and moved most of the text after the bullet points.
Changed some text for consistency with the bullet points.
Merged italicized objectives into the rest of the list.
Merged italicized summary points into the rest of the list.
Slight change of words in objectives.
Made files for challenges for the wildcard section.
Added a challenge question.
Added another challenge question for the wildcard section.
Had to put challenges subsection for wildcard section into the tutorial.html.

Changed notes on what to write in Escaping Special Characters box.
started to fill out box on escaping characters
started to filled out escaping characters boxes
 (need to modify challenge question)
Created two challenge questions on escaping characters.