Add travis CI config file and all the changes to make it compile there under both gcc and llvm clang

[Bigpet]

• various changes to make it compile with clang
• don't compile recompiler on linux yet but make the CMake build include asmjit already
• add experimental travis bot
• modify yml to match
• try to build and install wxWidgets, since it's not in the travis repo
• use newer cmake version for travis
• add keys with sudo
• use sudo for all apt- commands
• Add additional dependencies
• use version approriate gcc flags for c++11
• try clang, gcc too old
• set c++0x flag for clang
• use gcc 4.8
• use gcc 4.8 and add the repo for it
• use gcc 4.8 even for clang to get newer headers
• fix ambiguous conversions
• add lz from hykem and more explicit conversions from be for x86
• more switch disambiguation
• more switch disambiguation
• add additional unigned int casts to deal with be_t conversion ambiguity
• remove unnecessary clang flag
• add lz.cpp to vcxproj and cast to u32 instead of unsigned int
• correct temporaray #ifdefs