Added support for UUID property and ability to delete/update stub by UUID

[azagniotov]

• Added support for optional uuid property in YAML config
  • Added ability to GET stub by UUID by making a request to Admin portal API
  • Added ability to DELETE stub by UUID by making a request to Admin portal API
  • Added ability to UPDATE stub by UUID by making a request to Admin portal API
• Displaying UUID value in popup dialogs in Admin console when [view] YAML source button is clicked
• Revisited HTTP response codes of Admin portal APIs that manage stubs (delete, get & update APIs)
• Upgraded from Jetty 9.4.8.v20171121 to 9.4.9.v20180320
• Using ehCache v3.5.2 for internal caching
• Moved from XMLUnit v1.x to XMLUnit v2.x for a more optimized XML evaluation
• Upon parsing of YAML config, Compiling regex patterns using different flag combinations:
  • Pattern.MULTILINE
  • Pattern.MULTILINE | Pattern.DOTALL
  • Pattern.LITERAL (as a fallback if any of the aforementioned compilations failed)

[codecov-io]

Codecov Report

Merging #87 into master will increase coverage by 0.19%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage      99%   99.19%   +0.19%     
==========================================
  Files          35       33       -2     
  Lines        1100      994     -106     
  Branches      180      169      -11     
==========================================
- Hits         1089      986     -103     
+ Misses          4        3       -1     
+ Partials        7        5       -2

Impacted Files	Coverage Δ
...ithub/azagniotov/stubby4j/utils/DateTimeUtils.java	100% <100%> (ø)
...j/handlers/strategy/admin/GetHandlingStrategy.java	95.83% <100%> (+1.38%)	⬆️
.../github/azagniotov/stubby4j/stubs/StubMatcher.java	100% <100%> (+1.03%)	⬆️
...b/azagniotov/stubby4j/stubs/StubHttpLifecycle.java	97.5% <100%> (+0.16%)	⬆️
.../github/azagniotov/stubby4j/utils/StringUtils.java	97.4% <100%> (+0.14%)	⬆️
...j/handlers/strategy/admin/PutHandlingStrategy.java	100% <100%> (ø)	⬆️
.../handlers/strategy/admin/PostHandlingStrategy.java	100% <100%> (ø)	⬆️
...niotov/stubby4j/yaml/ConfigurableYAMLProperty.java	100% <100%> (ø)	⬆️
...andlers/strategy/admin/DeleteHandlingStrategy.java	100% <100%> (ø)	⬆️
...io/github/azagniotov/stubby4j/yaml/YamlParser.java	100% <100%> (ø)
... and 2 more

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