Linux 2.3 Open Source Gold Release

Support for Ubuntu 18.04 LTS 64-bit Desktop and Server version
Provided a new set of SGX common loader APIs in sgx_enclave_common.h
Provided the sample code for Switchless Call
Provided a new API in tcrypto: sgx_ecc256_calculate_pub_from_priv
sgx_create_enclave API will ignore the parameter of launch token and will not update it after function successfully returns
Change Intel SGX PSW installer for Ubuntu by
- Using .deb installer.
- Using name libsgx-enclave-common_{version string}-1_amd64.deb.
- Installing Intel SGX Enclave Common loader library.
Bug fixes

Linux 2.2 Open Source Gold Release

Support for Switchless Calls
Bug fixes

Linux 2.1.3 Open Source Gold Release

Security updates to Linux SDK and PSW
Support for Intel SGX Protected Code Loader

Linux 2.1.2 Open Source Gold Release

Security updates to Linux SDK and PSW

Linux 2.1.1 Open Source Gold release

Security updates to SDK and platform software

sgx_1.8: update instructions in README

Signed-off-by: Li, Xun <xun.li@intel.com>