[enhancement] kepler, memo and return the viewState before/after rendering

[chrisgervang]

Change List

• save mapState when preview/render starts, and reset it when it ends
• Remove geographical move camera presets.
• halve resolution while previewing to improve performance

[coveralls]

Pull Request Test Coverage Report for Build 1051043217

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 16.701%

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Totals
Change from base Build 1031054738:	0.0%
Covered Lines:	142
Relevant Lines:	667

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💛 - Coveralls