added more exclusions to .gitignore
allow querying array items by rel and name attributes
attribute lookup on array searches items by name
ensure href is a required parameter for collection
added docstrings
added lint target to Makefile
improved repr strings
expose data item names as 'properties' attribute in Item and Template
access data items via attribute lookup on item name
added tox config for testing with Python 2.7 and 3.3
added .tox folder to ignore list
Merge pull request #2 from ricardokirkner/usability-improvements

improve usability of classes

- access array items via attribute lookup on item name
- access data items via attribute lookup on item name
- allow querying array items by rel and name attributes
- expose data item names as 'properties' attribute in Item and Template
- improved repr strings