Increase size of transaction queue by default (#2519)

Conflicts:
	ethcore/src/miner/miner.rs
	parity/cli/config.full.toml
	parity/cli/mod.rs
	parity/configuration.rs

parity/cli.rs

@@ -193,7 +193,7 @@ Sealing/Mining Options:
   --extra-data STRING      Specify a custom extra-data for authored blocks, no
                            more than 32 characters.
   --tx-queue-size LIMIT    Maximum amount of transactions in the queue (waiting
-                           to be included in next block) [default: 1024].
+                           to be included in next block) [default: 2048].
   --tx-queue-strategy S    Prioritization strategy used to order transactions
                            in the queue. S may be:
                            gas - Prioritize txs with low gas limit;

parity/params.rs

@@ -215,7 +215,7 @@ impl Default for MinerExtras {
 			extra_data: version_data(),
 			gas_floor_target: U256::from(4_700_000),
 			gas_ceil_target: U256::from(6_283_184),
-			transactions_limit: 1024,
+			transactions_limit: 2048,
 		}
 	}
 }