update lab1_result

1. Now can edit/analysis/debug in eclipse
2. add .cproject .project in .gitignore
3. fix some warnning using gcc-4.8

labcodes_answer/lab1_result/kern/init/init.c

@@ -9,12 +9,12 @@
 #include <intr.h>
 #include <pmm.h>
 #include <kmonitor.h>
-int kern_init(void) __attribute__((noreturn));
+void kern_init(void) __attribute__((noreturn));
 void grade_backtrace(void);
 static void lab1_switch_test(void);
 
-int
-kern_init(void) {
+void
+kern_init(void){
     extern char edata[], end[];
     memset(edata, 0, end - edata);