Updated nokogiri dependency to 1.5.0

Trying to make the gem 1.8.7 compatible

Trying to test under multiple ruby versions

Updated to latest refinerycms(-blog)

Added 1.9.2 as build base to travis config

Removed RDoc rake tasks (not needed for now)

Merge branch 'master' of github.com:mremolt/refinerycms-wordpress-import

Bundle update

Merge pull request #4 from wikyd/ruby_1_8_7

Use File.expand_path instead of File.absolute_path to work with Ruby 1.8.7

Typo

Preparing for release 0.3.0

Resource import working

Image import working

Some specs for file Attachment