BUILD: Separate git rev from the version with a +

Per 10. of Semantic Versioning 2.0.0: build metadata.
DOCS: Update the wiki link in the README.md
DOCS: The TODO moved to our wiki
BUILD: Sync upstream boost.m4 changes

Based on 4765a2e4f1775c58765da5275c906ced5bba779d in
https://github.com/tsuna/boost.m4/

Changes done to upstream:
- Merge _BOOST_mingw_test into _BOOST_gcc_test
- Add test for gcc 4.9
- Add test for Boost.Atomic
- Changed how BOOST_FIND_LIB handles the CXX-PROLOGUE
  parameter. The generated test now inserts that parameter
  before the #include directive, instead of after.

  This is needed for the Boost.Atomic check, since unistd.h
  might only define intptr_t and not uintptr_t, but
  Boost.Atomic creates typedefs for both types. uintptr_t
  is still defined by stdint.h, but Boost.Atomic doesn't
  include that on purpose when compiling with gcc.

  To fix this issue, CXX-PROLOGUE is moved before the
  include and set to include both unistd.h and stdint.h,
  in that order.
COMMON: Work around glibc 2.19 breaking Boost.Atomic

Similar to the change in boost.m4, this fixes compilation
of uuid.cpp with glic 2.19 and Boost 1.54.
BUILD: Add Travis CI support.
BUILD: Add zlib dependency.
BUILD: Fix Travis dependencies.
BUILD: Add build notifications.
BUILD: Add build status image to README.
BUILD: Use markdown for build status.
AURORA: Remove Aurora::NWScript::setParams()

Apparently, va_start() is undefined with a reference
as the last non-va parameter. No matter, we don't need
this hacky function anyway.
DOCS: Replace copyright notes with trademark notes

As per issue #47, usage of copyright notes is wrong there.
ALL: Remove wrong-headed copyright note

See issue #47.
Instead, we list the trademarks in the AUTHORS now.
ALL: Update the copyright header

Replace "this software" with "xoreos" to make it more explicit
and link to the GPL on the web instead of suggesting to write
a letter to the FSF.
BUILD: Separate build fields in the version with a .

Per 10. of Semantic Versioning 2.0.0: build metadata.
DOCS: Update the copyright header in AUTHORS too