Fix #661: Append HTTPS to URLs without Protocol

[axismb]

When typing in a URL without a protocol (http://, https://, ftp://) for custom API URLs, auto-prepend https in front to fix Issue #661.

• Successfully able to enter maps.usf.edu/otp without prefix then plan a trip in Tampa, tested in Nexus 5 emu.
• gradlew connectedObaGoogleDebugAndroidTest connectedObaAmazonDebugAndroidTest: Success.

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[barbeau]

Thanks @azizmb9494! I'll try to review this soon. IIRC we have other URL clean-up code for the OBA API, so that might need to change back to how it is in the master branch.

[aaronbrethorst]

closing due to need for CLA signing and merge conflicts. please reopen with those issues resolved if you can! I'd love to land this PR!