Update eslint, jscs, mocha, retext
Add retext as a peer dependency
Fix spec for unknown nodes
Add cached Array#slice method
Fix confusing error messages
Add note to docs on possible incorrect trees
Fix and update JSDoc comments
Remove functionality to export exposed functions
Fix missing exception since 9c87110

- Check for new insertion error in replaceContent;
- Fix inconsistent return value when no value is inserted
  with replaceContent.
Remove extraneous unit test names
Add spec for removeOuterContent, replaceOuterContent
Add docs for removeOuterContent, replaceOuterContent
Fix confusing wording in docs
Add removeOuterContent, replaceOuterContent
Add bower.json
Update changelog for 0.2.0
0.2.0