include #37 but remove unnecessary changes, add the benchmark on this as well.
before
```
BenchmarkNetworkEqualIPv4-16          	 5917344	       198 ns/op	      64 B/op	       6 allocs/op
BenchmarkNetworkEqualIPv6-16          	 4486786	       273 ns/op	      42 B/op	       6 allocs/op
```
after
```
BenchmarkNetworkEqualIPv4-16          	100000000	        10.6 ns/op	       0 B/op	       0 allocs/op
BenchmarkNetworkEqualIPv6-16          	100000000	        10.9 ns/op	       0 B/op	       0 allocs/op
```
change newPathprefixTrie to not call newPrefixTree, save time on extra parseCIDR and NewNetwork
before
```
BenchmarkNewPathprefixTriev4-16                                    	 2731194	       440 ns/op	     288 B/op	      12 allocs/op
BenchmarkNewPathprefixTriev6-16                                    	 1610536	       743 ns/op	     456 B/op	      16 allocs/op
```
after
```
BenchmarkNewPathprefixTriev4-16                                    	13315774	        88.3 ns/op	      16 B/op	       4 allocs/op
BenchmarkNewPathprefixTriev6-16                                    	 7967464	       153 ns/op	      64 B/op	       4 allocs/op
```