Changes of net module.
Fixed old db version error (not saving datetime type). Fixed not keeping session id for every request. Fixed problem with ping method
Merge branch 'Development'

Conflicts:
	android/Duta/DutaMobile/src/main/java/com/dutamobile/net/NetClient.java
	android/Duta/DutaMobile/src/main/java/com/dutamobile/util/Helper.java
Totally changed net module.
 Contextual ActionBar added.
 Edit Dialog added
 Removing of contacts almost added
Merge branch 'master' into Development

Conflicts:
	android/Duta/DutaMobile/src/main/java/com/dutamobile/DutaApplication.java
	android/Duta/DutaMobile/src/main/java/com/dutamobile/fragments/ChatFragment.java
	android/Duta/DutaMobile/src/main/java/com/dutamobile/fragments/ContactListFragment.java
	android/Duta/DutaMobile/src/main/java/com/dutamobile/net/NetClient.java
	android/Duta/DutaMobile/src/main/java/com/dutamobile/util/Helper.java
Merge branch 'master' of https://github.com/neri14/projekt_zespolowy