Use murmur3 for hashing

[samfrench]

This PR updates the hash library from "fasthash" to "murmur3" due to compilation issues on a Mac. Looking through the fasthash repository there are many compilation issues across various devices.

This was raised in #17 and a PR was suggested.

[MarkBiesheuvel]

Thank you for the pull request!

I don't have automated testing set up, so I had to pull the branch and run the test locally. All looks good.

$ cargo test --all-features --release
   Compiling murmur3 v0.5.2
   Compiling optimizely v0.3.0 (/home/mark/projects/optimizely-rust-sdk/optimizely)
   Compiling results-demo v0.1.0 (/home/mark/projects/optimizely-rust-sdk/examples/results-demo)
   Compiling performance-test v0.1.0 (/home/mark/projects/optimizely-rust-sdk/examples/performance-test)
   Compiling network-test v0.1.0 (/home/mark/projects/optimizely-rust-sdk/examples/network-test)
   Compiling srm-test v0.1.0 (/home/mark/projects/optimizely-rust-sdk/examples/srm-test)
    Finished `release` profile [optimized] target(s) in 2.33s
     Running unittests src/main.rs (target/release/deps/network_test-2bae3fd2e66f0f79)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running unittests src/lib.rs (target/release/deps/optimizely-9d1a896ee2bfb8bc)

running 1 test
test datafile::traffic_allocation::tests::variation ... ok

test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running tests/client_initialization.rs (target/release/deps/client_initialization-e245101cebd67b79)

running 5 tests
test with_invalid_array_properties ... ok
test with_invalid_json ... ok
test with_missing_properties ... ok
test with_fixed_datafile ... ok
test with_sdk_key ... ok

test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.36s

     Running tests/decisions.rs (target/release/deps/decisions-7e68bceb86f468a7)

running 3 tests
test invalid_flag ... ok
test qa_rollout_flag ... ok
test buy_button_flag ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running tests/user_context.rs (target/release/deps/user_context-0f3b855262d9eae4)

running 3 tests
test user_context_with_attributes ... ok
test user_context_set_attribute ... ok
test user_context_track_event ... ok

test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running unittests src/main.rs (target/release/deps/performance_test-2f68ff890a176041)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running unittests src/main.rs (target/release/deps/results_demo-35fada1f3af5dfca)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running unittests src/main.rs (target/release/deps/srm_test-88139588bd926548)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

   Doc-tests optimizely

running 5 tests
test optimizely/src/client.rs - client::Client (line 19) ... ok
test optimizely/src/decision/decide_options.rs - decision::decide_options::DecideOptions (line 5) ... ok
test optimizely/src/client/initialization.rs - client::initialization::UninitializedClient (line 15) ... ok
test optimizely/src/client/user.rs - client::user::UserContext (line 24) ... ok
test optimizely/src/lib.rs - (line 11) ... ok

test result: ok. 5 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.65s

[MarkBiesheuvel]

Haha, I turns out I did have automated testing set up. Completely forgot about that. Merging now!

[samfrench]

@MarkBiesheuvel, thank you for the merge. I ran tests before the PR but wasn't sure myself what was setup to run or if there would need to be any changes done to it.