Merge pull request #4 from ibmcb/mrhines

fix for pymongo performance too slow
Changes:
Bugfix: Added automatic detection for installations where pymongo does not have
the appropriate C extensions (the absence of these can cause a 20x slowndown).
A very conspicuous (and annoying) warning is printed out *every time* the
mongodb datastore adapter is called, pratically forcing the user to re-install
pymongo with the appropriate extensions.
Bugfix: The script "cb_create_gmetad_config_file.sh" (on "common") still had
the directory "cloudbench" hard-coded on it.
added base specweb scripts without specweb jars