First pass at Google Breakpad support
Build into ../bin
Upload crash reports to crash report server
Install gdb on Travis
Remove dump after upload
MacOS Breakpad support
Don't link against breakpad_client on Windows
Run dsymutil on webkit_server before uploading Mac symbols
Let qmake choose the mkspec

Breakpad doesn't compile with clang when the mkspec is set to gcc.
Apparently link_prl doesn't work all the time