Added support file filenames in EMongoFile

refs #155
Switched or with ||

refs #156
Wrapped logical && into braces

refs #156
More safe if statement in getFilename()

refs #156
Merge pull request #156 from tvollstaedt/issue155

Added support for  filenames in EMongoFile
Added stream abilties in EMongoFile:
https://github.com/Sammaye/MongoYii/issues/155
Reverted last change
Doc fix
Fixed: https://github.com/Sammaye/MongoYii/issues/157
Fixed: https://github.com/Sammaye/MongoYii/issues/159
Merge branch 'master' of https://github.com/Sammaye/MongoYii.git
Fixed: https://github.com/Sammaye/MongoYii/pull/160
Merge remote-tracking branch 'upstream/master'
add config sample