Adding tests for .parent().
Fix bug in `parent` method

Ensure that the `parent` method operates over all elements in the set
and filters by the selector (when specified). Update methods that
utilize the method internally and documentation accordingly.
Implements contents()
Added mixed text test fixture
Add test cases for .contents()
Use _.reduce() instead of a manual loop in .contents()
Added newline at end of fixtures.js
Fixed a grammar mistake in fixtures.js
Merge branch 'contents' of https://github.com/jlep/cheerio

sad
:vq
:wq
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Msd

aerge branch 'parent-bug' of https://github.com/jugglinmike/cheerio

asdZ the commit.