Typo
Fix spelling of Alan Perlis' last name
Fix error in core-functions-in-depth (set -> list)

In 'content/core-functions-in-depth' line 459 it states "convert back to
set" when converting a vector into a list, this is corrected to "convert
back to list".
minor grammatical fixes and such
Merge pull request #15 from apiology/master

Fix spelling of Alan Perlis' last name
Merge pull request #13 from xsleonard/patch-2

Typo
Merge pull request #17 from willprice/master

Fix error in core-functions-in-depth (set -> list)
Merge pull request #19 from javaSpock/do-things-grammar

minor grammatical fixes and such