Document and fix go runtime support in gdb 7.6+
Handle multiple gopaths on windows.
Fix dependencies in osutil_windows.go
Convert ListSeparator into a string to use in Split.
Added info about compiling gdb on windows.
Fix index out of range panic.
Add GDB.Gdb{Set,Show}
Merge pull request #1 from ebfe/gdb-set-show

Add GDB.Gdb{Set,Show}