Fix Manifest version reading error to support jar:file protocol

[eyalkoren]

Fixes #599

[eyalkoren]

Jenkins run the tests

[codecov-io]

Codecov Report

Merging #601 into master will decrease coverage by 1.61%.
The diff coverage is 72.72%.

@@             Coverage Diff              @@
##             master     #601      +/-   ##
============================================
- Coverage     63.95%   62.33%   -1.62%     
+ Complexity      148       68      -80     
============================================
  Files           188      188              
  Lines          7573     7079     -494     
  Branches        889      816      -73     
============================================
- Hits           4843     4413     -430     
+ Misses         2454     2396      -58     
+ Partials        276      270       -6

Impacted Files	Coverage Δ	Complexity Δ
...apm/agent/bci/bytebuddy/CustomElementMatchers.java	75.9% <72.72%> (-1.43%)	0 <0> (ø)
...apm/agent/impl/transaction/TraceContextHolder.java	50% <0%> (-12.5%)	0% <0%> (-7%)
...va/co/elastic/apm/agent/impl/transaction/Span.java	63.76% <0%> (-11.03%)	0% <0%> (-21%)
...m/agent/impl/async/SpanInScopeCallableWrapper.java	62.96% <0%> (-8.09%)	0% <0%> (ø)
...m/agent/impl/async/SpanInScopeRunnableWrapper.java	64.28% <0%> (-7.51%)	0% <0%> (ø)
.../apm/agent/concurrent/ExecutorInstrumentation.java	45.45% <0%> (-6.36%)	0% <0%> (-1%)
...lastic/apm/agent/impl/transaction/Transaction.java	71.42% <0%> (-6.25%)	0% <0%> (-11%)
...bci/methodmatching/TraceMethodInstrumentation.java	59.57% <0%> (-5.37%)	0% <0%> (ø)
...ent/jaxrs/JaxRsTransactionNameInstrumentation.java	82.75% <0%> (-2.54%)	0% <0%> (-1%)
...va/co/elastic/apm/agent/impl/ElasticApmTracer.java	82.81% <0%> (-1.92%)	0% <0%> (-19%)
... and 3 more

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