Changes:
* Add is_main_frame param in RequestHandler._OnBeforePluginLoad
* Crash reporting (crashpad) configurable using crash_reporter.cfg file,
  see src/include/cef_crash_util.h and upstream cef/tools/crash_server.py
  for more details. Upstream [Issue #1995](https://bitbucket.org/chromiumembedded/cef/issues/1995/migrate-from-breakpad-to-crashpad).
* Fix CefRequestHandler::OnCertificateError callback trigger
* Fix potential OSR crash on renderer process recreation

…zak#222)

See also Issue cztomczak#274 to see command line switches related to spell
checking support.

Run wxpython example after compile.

Fix linux make-setup.py.

Update tools/toc.py.

There is still issue with building vcproj files to be resolved.

Currently supported on Windows is only Python 2.7 32-bit.

Remove patch deps on Windows and Mac platforms to facilitate building (cztomczak#300,
cztomczak#231, cztomczak#251).

Create tools/build.py and tools/build_module.py (cztomczak#210). Cleanup in directories
due to new build tools.

Update tools/automate.py.

DragData methods become Linux-only: GetImage(), HasImage(). This functionality
will be available on all platforms when patch is merged into upstream (cztomczak#251).

There are still issues with unittests and examples. Tkinter example
launches fine, but crashes sometimes.

Update vcproj files and other fixes. Add additional linker flag
/LARGEADDRESSAWARE to Allow 32-bit processes to access 3GB of RAM.
Set UNICODE for subprocess.

Update build tools. Update module comments with great details
on how these tools work.

Refactor make-setup.py and make it work cross-platform (cztomczak#299). Moved
to tools/installer/make.py .

Update docs.
Update requirements.txt.

Update tkinter example on Windows, doesn't support PNG images.

…k#294)...

Fixes to wxpython.py example, works great.

The hello_world.py example also works good.

Unit tests are working fine now.

When not providing parent window handle (NULL) during browser creation,
so that CEF creates top-level window itself, in such case must call
SetAsPopup on Windows.

Fixes to build.py tool to run all examples smoothly.

All examples do run fine on Windows now.

Add run_examples.py tool to run all examples that can be run on current
configuration.

Add "Quick build instructions for Windows" section indocs/Build-instructions.

Fix invalid types for window handles on Windows 64-bit (cztomczak#302).

Also fix long long for other pointers such as in PaintBuffer.
Also fix long long for uint types.
Get rid of invalid/unnecessary long conversions eg. from int64 type.

1. Build using prebuilt binaries and libraries from GH Releases
2. Build using binaries from Spotify Automated Builds
3. Build upstream CEF from sources

Successfully built the cefpython module. There are still some warnings
and issues to resolve, but it looks good.

Update makefiles.
Update installer setup for Mac.
Update Mac requirements in build instructions.
Add --fast-build option to automate.py.

Update build tools and makefiles.
Link to libc++ and libc++abi to avoid undefined symbol error.
Fix visibility: PyMODINIT_FUNC.
Minimum Mac version: 10.7.
Do not use ctypes.CDLL on Mac, load CEF framework statically.

Both Mac and Linux: Add -DNDEBUG and -O3 optimization flags.

libcef_dll_wrapper needs to be built using this command:

cmake -G "Ninja" -DPROJECT_ARCH="x86_64" \
      -DCMAKE_CXX_FLAGS="-stdlib=libc++" \
      -DCMAKE_BUILD_TYPE=Release ..
ninja libcef_dll_wrapper