Upgrade to v2 (FeatureBaseDB#2072)

Upgrade to v2

Merge pull request FeatureBaseDB#2065 from codysoyland/release-v1.4.0

Release v1.4.0

Merge pull request FeatureBaseDB#1965 from jaffee/release-v1.3.1

Release v1.3.1

Release v1.3.0

Merge pull request FeatureBaseDB#1794 from jaffee/release-v1.2.0

Release v1.2.0

Merge pull request FeatureBaseDB#1611 from codysoyland/release-v1.1.0

Release v1.1.0

Merge pull request FeatureBaseDB#1573 from codysoyland/release-v1.0.2

Release v1.0.2

Merge pull request FeatureBaseDB#1494 from codysoyland/release-1.0.1

Release 1.0.1

Merge pull request FeatureBaseDB#1484 from codysoyland/fix-default-ma…

…p-size-var

Unexport DefaultMapSize on 32-bit

Merge pull request FeatureBaseDB#1464 from codysoyland/changelog-1.0.0

Add changelog for v1.0.0