Add the ability to set python breakpoint commands from the SBBreakpoint &...

Add the ability to set python breakpoint commands from the SBBreakpoint & SBBreakpointLocation API's.  
You can either provide the function name, or function body text.
Also propagate the compilation error up from where it is checked so we can report compilation errors.

<rdar://problem/9898371>

llvm-svn: 205380