PHP-820: Internal cleanup: Get rid of MONGO_METHOD_BASE & friends

Step#1 of boatloads; Removed MONGO_METHOD calls to MongoId
PHP-820: Remove MONGO_METHOD calls to MongoDate
PHP-820: Remove MONGO_METHOD*() calls to MongoCode
PHP-820: Refactor MongoDB->command() a little so we can kill MONGO_CMD()
PHP-820: Get rid of MONGO_METHOD(MongoDB, command, ...)
PHP-820: Get rid of MONGO_CMD()
PHP-820: Get rid of MONGO_CMD()
PHP-820: Get rid of the last MONGO_CMD()
Fix unused variables compiler warnings
Updated CS after CR
Whopsy. Fix a typo in dropDatabase and repairDatabase, and added tests
Fix CS after CR

- Use "cmd" consistently for commands
- Typo and closing comment on same line as per CS
- Add a newline before a return
Merged Pull Request #452

* pull-request/452:
  Fix CS after CR
  Whopsy. Fix a typo in dropDatabase and repairDatabase, and added tests
  Updated CS after CR
  Fix unused variables compiler warnings
  PHP-820: Get rid of the last MONGO_CMD()
  PHP-820: Get rid of MONGO_CMD()
  PHP-820: Get rid of MONGO_CMD()
  PHP-820: Get rid of MONGO_METHOD(MongoDB, command, ...)
  PHP-820: Refactor MongoDB->command() a little so we can kill MONGO_CMD()
  PHP-820: Remove MONGO_METHOD*() calls to MongoCode
  PHP-820: Remove MONGO_METHOD calls to MongoDate
  PHP-820: Internal cleanup: Get rid of MONGO_METHOD_BASE & friends