Release v0.4.5

- version : 0.4.5

 [ author : guitarrapc ]

 [ Aug 1, 2014 ]

 #### Enhancement
 * Added Credential Parameter for ```Invoke-ValentiaDownload```, ```Invoke-Valentia```, ```Invoke-ValentiaAsync```, ```Invoke-ValentiaSync```, ```Invoke-ValentiaUpload```, ```Invoke-ValentiaUploadList```

 #### Changes
 * Now ```Invoke-Valentia`` and ```Invoke-ValentiaAsync``` Prereqisite action is sharing.

 #### Bug fix
 * Fix ```Invoke-ValentiaAsync``` had memory leak since v0.4.3 had been fixed.