Update grunt-wp-i18n NPM package

[netweb]

Update grunt-wp-i18n NPM package from v0.4.3 to 0.4.4 updates Grunt makepot task

Changelog via ​https://github.com/blazersix/grunt-wp-i18n/blob/develop/README.md

• Added the potComments option to change the copyright message.
• Added the updateTimestamp option to prevent the POT-Creation-Header from being updated if there aren't any other changes in the POT file.
• Requires npm install to update packages and dependencies

[netweb]

In r8464 Author: johnjamesjacoby

• Message: Updates to package.json:
• Indent with spaces VS tabs. See: ​http://yaml.org/spec/1.2/spec.html#id2777534
• Update grunt to 0.4.5.
• Update grunt-wp-i18n to 0.4.4.
• Alphabetize dependencies.
• Props netweb.