URL updated: Sed & Awk book
URL update: Mastering Reg. Exp. book
Book MRE updated to 3rd edition
Added a new book: Definitive Guide to sed
URL update: Programmer's Workbook
Fixed book authors' names format: now first + last
URL update: Programmer's Workbook (again)
URL update: Pocket Reference book
Fixed book URL, & needed escape
Book note moved
Now all books codes are in ISBN13 format
Link to Aurelio website
Added comments to explain the link syntax
Added trailing / to the URL
Added link to the GitHub project