Added 'ci' rake task.
Added 'ci' rake task.

* Added 'ci:prepare' task to prepare for the rcov, rdoc,
  and saikuro output.
* Added 'ci:spec' task to run rspec & rcov for the unit
  and integration specs.
* Added 'ci:saikuro' task to generate cyclomatic & token
  reports.
* Added SUDOLESS environmental variable to the install task.

engineyard/dm-core,datamapper/dm-core,ar-dm/ardm-core,alloy/dm-core,joevandyk/dm-core,tpitale/dm-core,tillsc/dm-core