Add rx1 rx2 package namespaces

[ingerul93]

Based on PR from #43
DO NOT MERGE!
Its only to test CI integration.

[codecov-io]

Codecov Report

Merging #44 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master      #44   +/-   ##
=========================================
  Coverage     94.59%   94.59%           
=========================================
  Files             5        5           
  Lines            74       74           
  Branches          5        5           
=========================================
  Hits             70       70           
  Misses            3        3           
  Partials          1        1

Impacted Files	Coverage Δ	Complexity Δ
...ava/com/groupon/grox/rxjava2/StoreOnSubscribe.java	100% <ø> (ø)	0 <0> (?)
...c/main/java/com/groupon/grox/rxjava2/RxStores.java	60% <ø> (ø)	0 <0> (?)

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