removed tests for ethocore-rpc for default travis build

.travis.yml

@@ -25,7 +25,6 @@ script:
 - cargo test --release -p ethash --verbose
 - cargo test --release -p ethcore-util --verbose
 - cargo test --release -p ethcore --verbose
-- cargo test --release -p ethcore-rpc --verbose
 - cargo test --release --verbose
 - cargo bench --no-run
 after_success: |

util/src/uint.rs

@@ -1217,6 +1217,8 @@ mod tests {
 
 	#[test]
 	#[should_panic]
+	// overflows panic only in debug builds. Running this test with `--release` flag, always fails
+	#[ignore]
 	pub fn uint128_add_overflow_panic() {
 		U128::from_str("ffffffffffffffffffffffffffffffff").unwrap()
 		+