Fix ignored id bug

[rmeissner]

Changes proposed in this pull request:

• Id's of EthRequests were ignored, therefore Bulk requests were not working as expected
• Retrofit doesn't allow extending interfaces, therefore we introduce an intermediate connector

@gnosis/mobile-devs

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 0.35%. The diff coverage is 100%.

@@             Coverage Diff              @@
##             master       #8      +/-   ##
============================================
+ Coverage     64.78%   65.13%   +0.35%     
- Complexity      138      142       +4     
============================================
  Files            46       47       +1     
  Lines           994     1004      +10     
  Branches        171      171              
============================================
+ Hits            644      654      +10     
  Misses          264      264              
  Partials         86       86

Impacted Files	Coverage Δ	Complexity Δ
...va/pm/gnosis/ethereum/rpc/RpcEthereumRepository.kt	90.74% <ø> (ø)	7 <0> (ø)	:arrow_down:
...ava/pm/gnosis/ethereum/rpc/EthereumRpcConnector.kt	0% <ø> (ø)	0 <0> (?)
.../java/pm/gnosis/ethereum/rpc/models/RpcRequests.kt	88.57% <100%> (+1.07%)	0 <0> (ø)	:arrow_down:
...ereum/rpc/retrofit/RetrofitEthereumRpcConnector.kt	100% <100%> (ø)	4 <4> (?)

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