add author module, fixture, and tests
more book tests
add tests and comment about keys named 'key'
more book query methods
add history module, fixture, and tests
add module, fixture, and tests for recent changes
add ISBN argument error
update readme
add editions module, fixture, and tests
update readme
reformat readme
small readme change
add failing test for edition iteration
another failing test
update hashie gem
client module documentation and more tests
readme tweaks
Merge pull request #8 from pemulis/master

More Client Modules and Request Methods