* Add alternative receiver for transfer in erc20 to erc20 mode
* Check limits in foreign erc20-to-erc20 relayRequest
* Add relayRequest unit test for foreign erc20-to-erc20
* Update initialize parameters in foreign erc20-to-erc20
* Refactor mocks contract structure
* Add solcov ignore on covered lines not reported
* Lint fixes
* Ignore abstract methods in coverage report
* Add unit test for not covered methods
* Add contract `Claimable` to contain functionality related ability to claim tokens
* The new contract is used in the bridge contracts and the erc677 token implementation
* Fix claimTokens to support all token transfers
Kirill Fedoseev
Gerardo Nardelli