USENIX Security summer 2020 submission

Phoenix version 0.3:

Major Changes:
- Support for trusted time by proxying a user-configurable
  percentage/probability of the time-related syscalls to a trusted
  time server.  The time server's public key is pinned to the Graphene
  image via a configuration parameter.

- Support for TLS for Graphene's nextfs and mdish filesystems.
  A root certificate for the servers is pinned to the Graphene image
  via a configuration paratmer.  The TLS connection is not yet
  mutuallyl authenticated; currently, only the client authenticates the
  server.

- Support for multiple nextfs and mdish mount points (previously,
  the implementations of each only allowed a single mountpoint of that
  type).

Phoenix Version 0.2

Major Changes:
  - epoll bug fixes
  - rename bug fixes
  - merge exitless PR from mainline Graphene

Phoenix Version 0.1

Major features:
  - initial version of nextfs client
  - initial version of mdish client
  - bearssl integration (though currently not used
    by mdish or nextfs)
  - a number of bug fixes to graphene to support
    a single process nginx deployment

Release v0.6

License change to LGPL (gramineproject#140)

* Update all headers to reflect LGPL license.

* Add submodule for gcc test inputs

* Add submodule for lmbench-2.5

* Fix Travis build with submodules

* Migrate driver to sub repository

Release v0.5beta

Release before changing the license from GPL to LGPL

release v0.4beta

Release of Graphene SGX:
Supporting native Linux application in Intel SGX enclaves.
Most applications are supported. Some features may still be buggy.

Improving portability of Graphene:
Eliminating GCC-ism of the host-generic code.
Easier to port to non-Posix platform (e.g., Windows without Cygwin).

release v0.3

- Bugfixes in PAL and SHIM
- Improvement of migration scheme in SHIM, which largely speed up
  forking
- Upgrade glibc to 2.19
- FreeBSD port
- Support OpenJDK, python and R

minor bugfixes in regression tests