Add address sanitizer build to travis-ci
Set llvm-symbolizer path
Use verbose make
Set test timeout to 30
Merge branch 'feature/asan' of https://github.com/czchen/r3 into czchen-feature/asan

Conflicts:
	.travis.yml
R3_NODE_H as the include guard
R3_LIST_H
remove point checking in str_array_free
remove unnecessary pointer check
fix request method code
free old pattern
there is already a pointer guard in zmalloc
Add some basic opcode
test r3_pattern_to_opcode
Add OP_EXPECT_NODASH opcode
remove duplicate header include
combined_pattern_len is not used
pass studied pattern
move bench_str.csv
delete old bench_str.csv