* Explicitly ignore .bak in gradle samples directory
* Add gradle wrapper to local-spec sample, make .java-version (jenv local) be less machine specific
* Include gradle plugin samples in travis build
* update versions of dependencies on swift4 and swift3
* change syntax for swift4
* run petstore script
* change enum case from UpperCamel to lowerCamel
* remove unneeded break statements
* avoid wrapping conditionals in parentheses
* avoid force casting
* run pod update on petstore/swift4/rxswift
* update project for swift 4
* run swift4-petstore-all.sh
* fix compile error
* avoid use iso8601 date strategy for encoder / decoder
* resolve file references