script to increment the package version on travis

gulp/increment_version.js

@@ -0,0 +1,17 @@
+const fs = require('fs')
+const child_process = require('child_process')
+
+const dev = process.env.TRAVIS && process.env.TRAVIS_BRANCH === 'dev' || true
+
+let version = child_process.execSync(`npm show tone${dev?'@next':''} version`).toString()
+version = version.split('.')
+//increment the patch
+version[2] = parseInt(version[2]) + 1
+//put it back in semver
+version = version.join('.')
+
+//write it to the package.json
+const packageFile = '../package.json' 
+const package = JSON.parse(fs.readFileSync(packageFile, 'utf-8'))
+package.version = version
+fs.writeFileSync(packageFile, JSON.stringify(package, undefined, '  '))