prevent MMS notification NPE

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Merge pull request #1821 from mcginty/mms-npe

prevent MMS notification NPE
remove old, unused resources

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Merge pull request #1825 from mcginty/resource-removal

remove old, unused resources
Add time to saved media filenames

see #1689
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MMS Fixes

1) Respect proxyIfPossible flag and make sure to try all mms APNs

2) Reorder mmsc connection process
requestRouteToHost of URL rather than MMSC on MMS Download

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Closes #1806
braces around loop, proper spacing

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Update Play services and add checksum

Quoting Google employee: "5.0.77 had some serious issues, team didn't want
anyone using it"

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use URLConnection for MMS because it's better

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Minor MMS cleanup.

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Closes #1827
Update language translations.

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Bump version to 2.1.5

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