allow ref: with external URLs
Merge branch 'hotfix/external-urls'
Merge branch 'hotfix/external-urls' into develop
standardized options and files array
Merge branch 'hotfix/filesarray'
Merge branch 'hotfix/filesarray' into develop
Merge branch 'develop'
Merge pull request #19 from dwightjack/master

Updated code to Gruntjs standards and allowed ref: with external URLs:
updated version
fix #20: Documentation on includes is incorrect
Merge pull request #21 from jnizet/fix/20

fix #20: Documentation on includes is incorrect
fix conflict merge with upstream