Design site module data structure
Add more conf snippets to the sample conf file
Implement site module create/destory/add_location features
Add site module test cases
Add internal function declarations of site module
Remove -O2 temporarily and add statcktrace.o to common dependencies
Implement site_handler
Add path_starts_with helper function
Add stacktrace handler for SIGFPE/SIGABRT, and print signal names
Fix path_starts_with bug
Merge branch 'site-handler'