fix spelling error and lacking boost header includes

I have boost in `/opt/boost-53` and after doing

```sh
mkdir build && cd build
cmake ../ -DBOOST_ROOT=/opt/boost-53/
```

I hit:

```sh
[  7%] Building CXX object CMakeFiles/osrm-extract.dir/extractor.cpp.o
In file included from /Users/dane/projects/Project-OSRM/extractor.cpp:26:
/Users/dane/projects/Project-OSRM/typedefs.h:29:10: fatal error: 'boost/integer.hpp' file not found
#include <boost/integer.hpp>
```

This pull fixes this problem of lacking includes being passed to the compiler.