Use system toast colors and ToastUtils class in all cases (getodk#2117)

Starting in Android 8.1, Toasts have black text on a white background by default. Using system defaults ensures a consistent experience across applications and fixes an issue where toasts in 8.1 were showing up as white on white.

Upgrade Javarosa to 2.9.0 (getodk#2090)

Merge pull request getodk#2069 from lognaturel/update-translations

Update March 2018 translations

Merge pull request getodk#2040 from lognaturel/jr-snapshot

Upgrade Javarosa

Update javarosa

Merge pull request getodk#1953 from lognaturel/collect-1952

Use auto-send attribute instead of auto-submit

Merge pull request getodk#1931 from lognaturel/update-translations

Update February translations.

Turn off debuggable builds for release (getodk#1898)

Check for null media path (getodk#1748)

Merge pull request getodk#1747 from lognaturel/version-npe

Version NPE