Release 1.7.0

• Fix comments (17a90ba)
• Fix documentation and examples (666f3bb)
• Use a named export each instead of a default export (21fa721)
• Upgrade gulp-shared-tasks 0.30.19 -> 0.30.20 (e6d2900)
• Upgrade gulp-shared-tasks 0.30.18 -> 0.30.19 (0e5708c)
• Upgrade gulp-shared-tasks 0.30.17 -> 0.30.18 (4fad4a5)
• Upgrade ava 2.1.0 -> 2.2.0 (47fd7b3)