- added ClearCase built-in plugin
- a new variable twister_tc_revision can be saved into DB
- fix for issue #94; nested configurations can be retrieved in test cases
- Implemented more variables inside e-mail subject and body, after the tests are run
    twister_user
    twister_ce_hostname
    twister_ce_ip
    twister_ce_os
    twister_ce_python_revision
    twister_ce_type
    twister_ep_hostname
    twister_ep_ip
    twister_ep_os
    twister_ep_python_revision
    twister_pf_fname
    twister_rf_fname
    twister_server_location
- updated userGuide
- updated Plugins document