Replaces depracated include_class by java_import.
Fixes test failures

This commit also:
 - fixes a way of requiring spec_helper and gem files
 - adds tmp dir creation before the test starts and deletion after the
   test ends
 - adds pry to Gemfile in development section
Naether gem version up
Adds CLI tests
WIP cli tests
Improves CLI tests and replaces 'tmp' by TEMP_DIR
Removes dependency to solr_sail
Updates thor version
Merge pull request #10 from yokolet/master

Thor version up, failing spec fixes, solr_sail dependecy deletion and new cli tests