add concat() test for mutating inputs
Add hash code helpers
Implement equality and hashcode in IndexedValue

add index to hashcode
Add core.firstNonNull()
Bump version to 0.14.0
Add README docs for firstNonNull and hash
Merge pull request #63 from sigmundch/patch-1

Implement equality and hashcode in IndexedValue
Add strings.equalsIgnoreCase and compareIgnoreCase
Merge pull request #66 from google/strings

Add strings.equalsIgnoreCase and compareIgnoreCase
Add docs for equalsIgnoreCase and compareIgnoreCase
Bump version to 0.15.0
Add listEquals and mapEquals
Review comments
Merge pull request #67 from google/collection

Add listsEqual and mapsEqual
Add strings.padLeft
Add strings.padLeft and padRight
Merge pull request #68 from google/pad

Add padLeft and padRight