Merge pull request #14 from tenbits/master

HasNext
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Update .travis.yml
Update .travis.yml
Merge pull request #15 from tenbits/master

Simplify Date.add**
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The day of a command's execution can be specified by two fields. Fixes #16
Move expression parser date incrementation logic to Date extensions file
Code cleanup
Move inline matching function to class level
Deprecate and remove existing synchronous methods. Make parse functions synchronous by the default. Closes #17
Update README.md
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Require 'fs' module inside 'CronParser.parseFile' method. Fixes #18