bugfix(android): Fixes crash on sdk27+ devices when saving to gallery

[AdamAtri]

PR Checklist

• [x ] The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• [x ] There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• [ x] All existing tests are passing
• [ x] Tests for the changes are included

What is the current behavior?

On android devices running 27+ the app crashes when saving to the gallery.
This is caused by the creation of the picturePath. On 27+ devices the "Camera" directory is not created in the DCIM dir.

What is the new behavior?

The new code creates the 'Camera' directory if it does not exist.
Then verifies that there is a file at the expected location

Fixes/Implements/Closes #[225, 236].
BREAKING CHANGES: none
Migration steps: none

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[AdamAtri]

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[AdamAtri]

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[AdamAtri]

I have signed the cla 3 times
and the Travis CLI failures are yours ---> Cannot read property 'SAUCE_USER' of undefined

[luke-hawk]

Hey @AdamAtri – did you give up on this PR?😄 ...I also need a fix for #236 and #225