Updated feature: Mango v0.3.4

+ New: Added Mango::getConnection - method that gets current
  instance of MongoClient
+ Fixes: PHPDoc fixes
Updated feature: Mango_Collection v0.4.4

+ New: Added Mango_Collection::safeDrop - method that drop
  current collection, throw exception on errors
+ New: Added Mango_Collection::hasOption - method that see
  if a cursor has an option to be set before executing the
  query
+ Fixes: Minor PHPDoc fixes
Updated feature: Some Mango Reader fixes
Fixed issue: Mango_Collection::hasOption fixes
Merge pull request #446 from sergeyklay/master

Mango improvements