PluginsList test

still need SWTBot functionalities

Related to issue karlitrotski/CodingSpectator/#35 (test coverage). 
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PluginsList test

Finished. Added some commentaries

Related to issue karlitrotski/CodingSpectator/#35 (test coverage).

Pair Programming with @karlitrotski
Plugins Monitor test

Still needs SWTBot functionalities

Related to issue karlitrotski/CodingSpectator/#35.
Pair Programming with @karlitrotski
PluginsMonitor's Test
added some comments and SWTBot functionalities

Related to issue karlitrotski/CodingSpectator/#35 (test coverage).
Pair Programming with @karlitrotski