Create v5.4 Release

[kmanning]

• Issue #87 Add travis CI support to the project
• Issue #186 Add convenience method to detect the version of terraform
• Issue #185 Fix defect: filename parameter is not used in TerraformPlugin.readFile

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@5cbf731). Click here to learn what that means.
The diff coverage is 60.25%.

@@            Coverage Diff            @@
##             master     #191   +/-   ##
=========================================
  Coverage          ?   52.77%           
=========================================
  Files             ?       31           
  Lines             ?      775           
  Branches          ?      210           
=========================================
  Hits              ?      409           
  Misses            ?      282           
  Partials          ?       84

Impacted Files	Coverage Δ
src/AgentNodePlugin.groovy	0% <0%> (ø)
src/FileParametersPlugin.groovy	18.75% <0%> (ø)
src/Jenkinsfile.groovy	16.94% <100%> (ø)
src/TerraformInitCommand.groovy	91.89% <100%> (ø)
src/TerraformPlanCommand.groovy	90.9% <100%> (ø)
src/TfvarsFilesPlugin.groovy	100% <100%> (ø)
src/TerraformApplyCommand.groovy	90.62% <100%> (ø)
src/RegressionStage.groovy	26% <100%> (ø)
src/TerraformPlugin.groovy	51.42% <35%> (ø)
src/CrqPlugin.groovy	43.58% <50%> (ø)
... and 5 more

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