added updateAccountFromObject function to update Account using the Object itself as parameter
- generates fields only for allowed coloumns and removes empty ones from update query
- modified Account to hold DateTime instance for birthday and cv_date
- this function also uploads cv files to salesforce as attachments and sets date of upload and cvUploaded in fields list that will than be updated in salesforce account
- added action to DevController to play with mentioned new functionallity

TODO:
- a lot of error checking
- commenting
- writing similar function for EP-Objects
- specifying MAX_FILE_SIZE (currently set to 500B)