Trivial typo fixes.
Fix broken(?) boldness.
Merge commit 'upstream/master'

Conflicts:

	sections/values.pod
Merge commit 'upstream/master'
Remove spurious (?) 'all' from comment.
Missing =begin/=end screen.
Missing C<...> on code.
Merge commit 'upstream/master'
Merge commit 'upstream/master'
Trivial grammar fix.
Merge commit 'upstream/master'
Merge commit 'upstream/master'
Improved epub's XHTML generation.
Fixed Z<> links in ePub again.
Fixed mistakenly swapped bless operands.
Removed ePub linear disabling to fix display.

This helps the iBooks version, at least.
Liberalized license.
Fixed UTF-8 file encoding. See GH #158.
Fixed ternary ordering in "The Ternary Conditional Operator" (Chapter 3, Control Flow Section)
Fix for issue #162. Changed trim/escape order, fixed trim (it was missing a slash), and fixed non-word regex char class