Added support for path param repeated primitive fields

Added conversion functions for repeated path params
Updated bytes converter to support URL encoded base64 strings

Added support for repeated primitive path params in protoc-gen-grpc-gateway
Added support for repeated primitive path params in protoc-gen-swagger
Added --repeated_path_param_separator cmd line param to support setting separator to `csv`, `ssv`, `pipes` and `tsv`

Re-generated examples
Added ABitOfEverythingRepeated to validate repeated path parameter functionality
Added GetRepeatedQuery rpc endpoint
Updated browser tests to test GetRepeatedQuery rpc endpoint
Updated integration tests to test GetRepeatedQuery rpc endpoint
Added GetRepeatedQuery to ABitOfEverythingServer implementation

Added missing reflect.DeepEqual test

Change separator type from string to rune
Fixed slice duplication in string slice conversion method
Reverted --allowRepeatedFieldsInBody in swagger generator
Changed TODO of bytes slice proto2 function

Corrected if-statement releated to repeated fields in resolveFieldPath function

Rebase