1.8.1 (fastlane)

1.8.0 (fastlane)

Bump version to 1.7.1

Bump version to 1.7.0

Bump version to 1.6.1

Bump version to 1.6.0

Update README.md

Merge pull request onevcat#95 from onevcat/feature/resource-based-api

Resource based api

Merge pull request onevcat#89 from onevcat/fix/clean-expired-type-cast

Try to fix issue 86

Fix orientation issue for JPG files.