[CB-5565] Incremented plugin version on dev branch.
Handle error when splash image is missing.

From pull request:
https://github.com/apache/cordova-plugin-splashscreen/pull/1
CB-5658 Delete stale snapshot of plugin docs
CB-5658 Add doc.index.md for Splashscreen plugin
CB-5658 Update license comment formatting of doc/index.md
CB-5719 Updated version and RELEASENOTES.md for release 0.2.6