added Intellij IDEA directories to .gitignore
added *.iml file to .gitignore
make test WhenAsciidocotrAPICallIsCalled.api_parameters_should_be_transformed_to_cli_command() pass on windows as well. Used File seperator instead of "/"
This fixes issue #107. In environments with similar classloading issues like sbt, ANT or others. Use org.asciidoctor.Asciidoctor.Factory.create(ClassLoader classloader), passing a classloader that holds all asciidoctorand JRuby classes, instead of using  org.asciidoctor.Asciidoctor.Factory.create().

 The latter may use a different classloader(depends on the ThreadcontextClassloader i think) inside the JRuby runtime causing messages like org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- jruby/java