modifying the generated code to allow returning Function instances

1. Bumped to version 3.5.0.

2. Regenerated Solidity smart contract wrappers in codegen module.

Bumped release version.

1. Regenerated smart contract wrappers.

2. Added suppress warning annotation to codegen for working with array types.
3. Bumped version to 3.3.1.

Merge remote-tracking branch 'origin/master' into android

# Conflicts:
#	build.gradle

Merge pull request hyperledger-web3j#346 from TiesNetwork/master

Contract wrapper generator should convert array items to native types

Updated version.

Updated version to 3.1.1 in docs.

Merge pull request hyperledger-web3j#243 from joanesespanol/android

Android

1. Added MetaCoin smart contract wrapper to integration-tests module …

…and build script.

2. Documentation updates.