Update doc with information about LLVM 3.4
Update include path for Archive.h
raw_fd_ostream::F_Binary -> sys::fs::F_Binary
Converts all llvm::sys::Path variables into std::string
Remove support for compressed archives

LLVM API for llvm::Archive has changed in LLVM 3.4. The new class
is llvm::object::Archive and its members have been updated

Since the archive support is not mandatory in Jade, we drop all
references to these features
llvm::sys::Program::<static_member>() -> llvm::sys::<static_func>()
Fix PassManager location (now in llvm::legacy namespace)
Update list of LLVM modules used