4 features implemented: Get xing data, Save xing data, display xing data, get LinkedIn data

#26 Get Xing Data: Get Data from Xing by parsing received json data to
strings
#64 Save Xing Data: Save parsed data in database
#44 Display Xing Data: New Panel, which shows the Xing data stored in
database
#27 Get LinkedIn Data: Get Data from LinkedIn by parsing received xml
data to strings