changed returned integer values to be long.

[DvirDukhan]

solves issue #72

[codecov]

Codecov Report

Merging #73 into master will decrease coverage by 0.06%.
The diff coverage is 75.00%.

@@             Coverage Diff              @@
##             master      #73      +/-   ##
============================================
- Coverage     77.89%   77.83%   -0.07%     
- Complexity      179      181       +2     
============================================
  Files            23       23              
  Lines           552      555       +3     
  Branches         60       61       +1     
============================================
+ Hits            430      432       +2     
  Misses           96       96              
- Partials         26       27       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../com/redislabs/redisgraph/graph_entities/Edge.java	72.00% <ø> (ø)	8.00 <0.00> (ø)
...dislabs/redisgraph/graph_entities/GraphEntity.java	65.00% <ø> (ø)	9.00 <0.00> (ø)
.../redislabs/redisgraph/graph_entities/Property.java	76.92% <50.00%> (-1.34%)	10.00 <2.00> (+2.00)	⬇️
...slabs/redisgraph/impl/resultset/ResultSetImpl.java	78.89% <100.00%> (ø)	35.00 <1.00> (ø)

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