Upgrade antlr version to 4.7#20

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Commits on May 16, 2017

Remove unused import
ui4j
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removed deprecated api usage
ui4j
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update the antlr metadata runtime version 4.7
ui4j
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Removed unused variables
ui4j
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Replaced deprecated ANTLRInputStream with CharStreams
ui4j
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organized & fixed warnings
ui4j
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removed deprecated JavaCC implementation
ui4j
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removed javacc grammer files
ui4j
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upgrade the external dependencies
ui4j
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add build file (travis-ci)
ui4j
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removed unused import & warnings
ui4j
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Commits on May 17, 2017

Removed JavaCC from feature list
ui4j
authored