Hamdi/client

[hamdiallam]

1. Introduce a new client module

   • client query methods to enable code reuse between the rest handlers and cli commands. resolves #164

2. Introduce tx, output, and height handlers/queriers for the rest-server

TODO: test cli/rest commands with these new changes.

[codecov-io]

Codecov Report

Merging #171 into develop will decrease coverage by 0.83%. The diff coverage is 12.24%.

@@             Coverage Diff             @@
##           develop     #171      +/-   ##
===========================================
- Coverage    52.58%   51.75%   -0.84%     
===========================================
  Files           28       28              
  Lines         1314     1314              
===========================================
- Hits           691      680      -11     
- Misses         516      529      +13     
+ Partials       107      105       -2

Impacted Files	Coverage Δ
store/outputs.go	68.06% <ø> (ø)	:arrow_up:
plasma/position.go	61.11% <ø> (-0.21%)	:arrow_down:
store/querier.go	0% <0%> (ø)	:arrow_up:
utils/utils.go	100% <100%> (ø)	:arrow_up:
plasma/transaction.go	51.49% <20%> (-0.82%)	:arrow_down:
eth/main.go	43.33% <0%> (-6.67%)	:arrow_down:

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[colin-axner]

@hamdiallam if you have time to fix the merge conflicts, I'm fine including this in 1.0

[hamdiallam]

@hamdiallam if you have time to fix the merge conflicts, I'm fine including this in 1.0

I'm going to fix the merge conflicts. Not heavy