Print unsigned values (or better hex)

[x8-999-github]

Hello,

It would bey very nice if it where possible to print value in hex and if possible also print unsigned values as unsigned. In gdb the print command accepts /x to print in hex.
I currently made a small modification for myself that .. is not ready for prime time.

diff --git a/src/core/common.cpp b/src/core/common.cpp
index ea92196..7760605 100644
--- a/src/core/common.cpp
+++ b/src/core/common.cpp
@@ -723,7 +723,7 @@ namespace oclgrind
       switch (size)
       {
       case 1:
-        cout << (int)*(char*)data;
+        cout << hex << (unsigned int)(unsigned char)*(char*)data;
         break;
       case 2:
         cout << *(short*)data;