add encodeSignedB64() method

[javeme]

Change-Id: Id9be98cb3b03dc3fe0bc5b3d6b6b3674518e6260

[codecov[bot]]

Codecov Report

Merging #46 into master will increase coverage by 0.88%. The diff coverage is 94.44%.

@@             Coverage Diff              @@
##             master      #46      +/-   ##
============================================
+ Coverage     80.85%   81.73%   +0.88%     
- Complexity      650      673      +23     
============================================
  Files            56       56              
  Lines          1985     2004      +19     
  Branches        291      297       +6     
============================================
+ Hits           1605     1638      +33     
+ Misses          252      243       -9     
+ Partials        128      123       -5

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/baidu/hugegraph/rest/RestResult.java	86.66% <ø> (ø)	9 <0> (ø)	:arrow_down:
...com/baidu/hugegraph/license/FileKeyStoreParam.java	100% <ø> (ø)	5 <0> (ø)	:arrow_down:
...ava/com/baidu/hugegraph/version/CommonVersion.java	50% <ø> (ø)	1 <0> (ø)	:arrow_down:
.../java/com/baidu/hugegraph/license/MachineInfo.java	88.33% <100%> (ø)	14 <0> (ø)	:arrow_down:
...a/com/baidu/hugegraph/util/InsertionOrderUtil.java	90% <100%> (+47.14%)	9 <3> (+6)	:arrow_up:
...in/java/com/baidu/hugegraph/util/LongEncoding.java	94.36% <93.33%> (+7.09%)	31 <11> (+12)	:arrow_up:
.../main/java/com/baidu/hugegraph/perf/Stopwatch.java	87.75% <0%> (+2.04%)	21% <0%> (+1%)	:arrow_up:
.../main/java/com/baidu/hugegraph/event/EventHub.java	81.94% <0%> (+4.16%)	27% <0%> (+2%)	:arrow_up:
...n/java/com/baidu/hugegraph/concurrent/RowLock.java	80.43% <0%> (+4.34%)	11% <0%> (+1%)	:arrow_up:
...m/baidu/hugegraph/iterator/ExtendableIterator.java	81.57% <0%> (+5.26%)	15% <0%> (+1%)	:arrow_up:

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