Spark 2.9.3

• Usage of deprecated SslContextFactory functions updated to new ones <a href="https://github.com/perwendel/spark/pull/1194">#1194</a>
• Modify Base64 to use java.util.Base64 Encoder/Decoder rather than the sun.misc classes <a href="https://github.com/perwendel/spark/pull/1193">#1193</a>
• Broken travis build fixed <a href="https://github.com/perwendel/spark/pull/1192">#1192</a>
• Jetty version updated to latest <a href="https://github.com/perwendel/spark/pull/1191">#1191</a>
• Add methods for removing routes at runtime <a href="https://github.com/perwendel/spark/pull/1189">#1189</a>
• Ensuring closage of InputStreamSerializer streams <a href="https://github.com/perwendel/spark/pull/1121">#1121</a>
• Getting all mapped routes <a href="https://github.com/perwendel/spark/pull/1100">#1100</a>
• Expose get/set on Service.embeddedServerIdentifier <a href="https://github.com/perwendel/spark/pull/1071">#1071</a>