Critical bug fix and api

[ambud]

Critical bug fix for iterator #131

Adding compaction APIs

[codecov-io]

Codecov Report

Merging #134 into master will decrease coverage by 0.07%. The diff coverage is 52.38%.

@@             Coverage Diff              @@
##             master     #134      +/-   ##
============================================
- Coverage     57.09%   57.02%   -0.08%     
- Complexity      978     1012      +34     
============================================
  Files           122      124       +2     
  Lines          5825     5992     +167     
  Branches        690      713      +23     
============================================
+ Hits           3326     3417      +91     
- Misses         2298     2365      +67     
- Partials        201      210       +9

Impacted Files	Coverage Δ	Complexity Δ
...java/com/srotya/sidewinder/core/storage/Field.java	23.07% <ø> (ø)	1 <0> (ø)	:arrow_down:
...a/com/srotya/sidewinder/core/SidewinderServer.java	4.65% <0%> (-0.06%)	3 <0> (ø)
...rotya/sidewinder/core/rpc/MetadataServiceImpl.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
.../com/srotya/sidewinder/core/storage/DataPoint.java	95% <0%> (ø)	9 <0> (ø)	:arrow_down:
...com/srotya/sidewinder/core/api/DatabaseOpsApi.java	17.97% <0%> (-7.42%)	2 <0> (ø)
...otya/sidewinder/ingesters/statsd/StatsdServer.java	0% <0%> (ø)	0 <0> (?)
...ya/sidewinder/core/monitoring/ResourceMonitor.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...sidewinder/core/functions/MultiSeriesFunction.java	0% <0%> (ø)	0 <0> (ø)	:arrow_down:
...com/srotya/sidewinder/core/storage/ValueField.java	71.03% <100%> (+0.54%)	28 <0> (+1)	:arrow_up:
.../com/srotya/sidewinder/core/storage/TimeField.java	67.67% <100%> (+0.5%)	29 <0> (+1)	:arrow_up:
... and 22 more

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