Version 0.1.21

* Added API introspection (set intro: true in access.js to switch on)
* Added "update" command to update OS and npm: service impress update
Version 0.1.22

* Fixed API introspection: .existsSync replaced to asynchronous analogs
with async.parallel
Version 0.1.23

* Added database shorthand for database access. Long name:
client.application.databases.databaseName.collectionOrTableName.accessMethodName.
Short name we can specify in appName/config/databases.js database
parameter "alias"
* Added new examples, refactored examples structure and database access
* Fixed Client.fileHandler (callback leak)
Version 0.1.24

* Fixed long worker fork from child process in cluster mode, it
translates request to master process (via IPC message
"impress:longworker") and master process forks
* Added new api examples for mongodb, file access, request to remote api
and hybrid asynchronous example