sophia: add gdb to travis-ci build
sophia: add gdb to travis-ci build

clibs/sophia,perint/sophia,mneumann/sophia,mknight-tag/sophia,mneumann/sophia,mneumann/sophia,Bitcoinsulting/sophia,perint/sophia,perint/sophia,mknight-tag/sophia,mknight-tag/sophia,Bitcoinsulting/sophia,tarantool/sophia,tarantool/sophia,clibs/sophia,clibs/sophia,tarantool/sophia,Bitcoinsulting/sophia