Merge branch 'master' into develop

README.txt

+# openair-cn-cups
+Control User Plane Separation of SPGW-C and SPGW-U
+├── http://www.openairinterface.org/?page_id=698 
+
+It is distributed under OAI Public License V1.0. 
+The license information is distributed under LICENSE file in the same directory.
+
+The OpenAirInterface CN CUPS software is composed of the following parts: 
+
+openair-cn-cups
+├── build :       Build directory, contains targets and object files generated by compilation of network functions. 
+    ├── log :     Directory containing build log files.
+    ├── scripts : Directory containing scripts for building network functions
+    ├── spgw_c :  Directory containing CMakefile.txt and object files generated by compilation of SPGW-C network function. 
+    ├── spgw_u :  Directory containing CMakefile.txt and object files generated by compilation of SPGW-U network function. 
+├── etc :         Directory containing the configuration files to be deployed for each network function.
+└── src :         Source files of network functions.
+    ├── common :    Common header files
+    │   ├── msg :   ITTI messages definitions.
+    │   └── utils : Common utilities.
+    ├── gtpv1u :    Generic GTPV1-U stack implementation
+    ├── gtpv2c :    Generic GTPV2-C stack implementation
+    ├── itti :      Inter task interface 
+    ├── oai_spgwc : SPGW-C main directory, contains the "main" CMakeLists.txt file.
+    ├── oai_spgwu : SPGW-U main directory, contains the "main" CMakeLists.txt file.
+    ├── pfcp :      Generic PFCP stack implementation.
+    ├── pgwc :      PGW-C network fonctions procedures and contexts.
+    ├── sgwc :      SGW-C network fonctions procedures and contexts.
+    ├── spgwu :     SPGW-U network fonctions procedures and contexts.
+    │   └── simpleswitch : Very Basic Switch implementation.
+    └── udp :       UDP server implementation.
+
+RELEASE NOTES:
+
+v1.0.0 -> First release, Able to serve a MME with basic attach, detach, release, paging procedures, default bearer only.