Merge branch 'hotfix/0.1.11'
Merge branch 'release/0.1.12'
Merge branch 'release/0.1.13'
Merge branch 'release/0.2.0'
Merge branch 'release/0.3.0'
Create a TunnelMonoid
Create IncrementingTunnelMonoid, update comments
Combine TunnelMonoid and IncrementingTunnelMonoid work
Refactor common tests
Get rid of deprecated call
Override isNonZero, minor comment tweak
Add license header
Rename IncrementingTunnelMonoid to PromiseLinkMonoid, fix minor issues
Merge pull request #213 from jcoveney/jco/tunnel_monoid

Create TunnelMonoid and IncrementingTunnelMonoid to allow hooking into async monoid computation
Use Await
Properly use Await
Merge pull request #212 from jcoveney/jco/update_util_algebra

Get rid of deprecated Future call in UtilAlgebraProperties
make decayed value monoid a separate class
Merge pull request #223 from tsdeng/separate_decayed_value_monoid

Separate decayed value monoid
SketchMap#create improvements