Upgrade to latest Pug4J 2.0.0-alpha-2

[michaelstresing]

Closes: #17

Following the release of pug4j, this PR:

• Upgrades jade4j:1.2.7 to pug4j:2.0.0-alpha-2 and spring-jade4j:1.2.7 to spring-pug4j:2.0.0-alpha-2.

• setBasePath has been replaced with setTemplateLoaderPath

• Updates naming from Jade to Pug across package, files, and tests. Including JadeHelper -> PugHelper

• Updates README

[coveralls]

Pull Request Test Coverage Report for Build 132

• 23 of 23 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 95.918%

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Totals
Change from base Build 131:	0.0%
Covered Lines:	47
Relevant Lines:	49

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💛 - Coveralls

[domix]

just merged, thank you @michaelstresing