Added Python 3.4. to the Travis build.
Added all Python 3.4 links.
Merge from 'master' branch.
Switched back to 'python3' command.
Fixed cyclic imports.
Merge branch 'master' into python3.4
Merge pull request #47 from jacebrowning/python3.4

Add Python 3.4. to the Travis build.
Added tests for

TODO:

- [ ] merge branch for parent attributes
- [ ] finish tests
- [ ] apply parent/chile link terminology
- [ ] implement CLI tests
- [ ] implement CLI
Added kwargs to Item/Document classes.
Removed 'document' and 'tree' args from methods.
Rearranged the arguments to Item/Document.new().
Refactored common tree.
Comment cleanup.
Merge pull request #60 from jacebrowning/parent-object-references

Determine how to let class instances access each other.
Merge branch 'master' into child-link-publishing.
Test cleanup.
Renamed find_rlinks() to find_child_links().
Added Item.find_child_items/documents().
Added child aliases.
Added '--with-child-links' option.