Merge branch 'avtobiff:debian/remove-require-rubygems'
fix warning in reader test
lock Nokogiri version to ~> 1.5.10

- cannot install Nokogiri 1.6.0 on Ruby 1.8.7
- Nokogiri 1.6.0 currently incompatible w/ JRuby
Merge pull request #415 from mojavelinux/template-testing

fix tests for testing slim and haml backends
Merge pull request #412 from mojavelinux/disable-last-updated

use labels for version and last updated
resolves #419 constrained monospace using backtacks supports role
resolves #421 support escaping the attributes that precede formatted text
add additional test
resolves #423 add option? method to AbstractNode
Merge pull request #424 from mojavelinux/option-method

resolves #423 add option? method to AbstractNode
resolves #200 add support for checklists in unordered list
Merge pull request #422 from mojavelinux/escape-formatted-text-role

resolves #421 support escaping the attributes that precede formatted text
Merge pull request #420 from mojavelinux/backtick-role

resolves #419 constrained monospace using backtacks supports role
Merge pull request #391 from mojavelinux/table-header-convention

resolves #387 implicit table header row
restrict checkbox matching to ulist
Merge pull request #426 from mojavelinux/checklists

resolves #200 add support for checklists in unordered list
add checklist ul class to default stylesheet, use it
use option? for checklist, correct option attribute name
resolves #428 embed CSS by default, copycss when linkcss is set

- additionally, link to custom css if SafeMode > SECURE
resolves #431 use ul list for TOC in HTML5 backend

- remove use of invalid type="none" attribute
- default stylesheet provides styling for TOCs using either ol or ul